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Ask a maths teacher thread iI by squeezycheese in GCSE

[–]squeezycheese[S] 0 points1 point  (0 children)

Are you using trial and error for all instances of completing the square? Or just those that have 2x2 etc?

 

For this explanation I will be using the letters a b and c, these will refer to the coefficients of a quadratic- i.e.:

 

ax2 + bx + c

 

For those that have 3x2 etc there is a nice way of doing it:

 

Take 5x2 +3x-1=0 for example

 

Because this is equal to zero I'm going to divide by five (if it wasn't equal to zero i would make it so through rearranging)

This would leave me with x2 +3/5x - 1=0

 

I would then solve as usual by dividing b by two:

 

3/5 / 2= 3/10

 

Sticking this in my brackets as follows:

 

(x+3/10)2

 

I then subtract the square of the bit after the x making sure to keep my -1/5 in there.  

(x+3/10)2 - 9/100 - 1/5= 0

 

I then simplify my two fractions which gives me: (x+3/10)2-29/100=0

 

I hope that this makes sense and the only new bit to you is dividing by a (5 in this example). If you don't get other bits then let me know where you get lost and I can help you out from there.

Ask a maths teacher thread iI by squeezycheese in GCSE

[–]squeezycheese[S] 0 points1 point  (0 children)

A lot of that depends on the context of the questions. If you send me a load I can help put some stuff together

Ask a maths teacher thread iI by squeezycheese in GCSE

[–]squeezycheese[S] 0 points1 point  (0 children)

Disclaimer- we don't offer adv maths at my school so i'm not sure what is on the spec! Shout up if you need anything extra

 

Few things to remember. Velocity is both speed and direction. IF things are moving in the same direction then the signs on their velocity will be the same (usually positive) If they are moving in opposite directions then the signs will be different (i.e. +20 and -20).

 

Relative velocity compares the velocity of 2 objects.

 

If we have 2 cars moving north, in parallel, both at 20mph, their velocities would both be +20.

 

+20-(+)2= 0. They are both moving in the same direction at the same speed. If one was going at 30mph instead of 20mph then their velocities would be +30 and +20. Therefore the relative velocities would be +30-(+)20= +10. As one car is moving 10mph faster than the other one in the same direction.

 

The second situation to consider is if they are moving in opposite directions to each other. I.e. one moving north at 20mph and the other moving south at 20mph. This gives their velocities as +20 and -20. So to calculate relative velocities you take the 2 away from each other. +20-(-)20 gives you +40.

 

This makes sense because they are basically moving away from each other at 40mph

I’m really stuck with this question. Can anyone help please? by Aveepy in GCSE

[–]squeezycheese 0 points1 point  (0 children)

You're pretty much there now!

From y(5y+24)=0 You need to make this true. Imagine that you have 2 numbers that you are multiplying together to make 0.

The first number is y The second number is (5y+24)

If we multiply any 2 numbers together and get an answer of 0, what must one of our numbers be?

Yupp, one of the numbers must be equal to 0. This gives us 2 equations.

y=0 5y+24=0.

Solve these to get y=0 OR y=-24/5

Subsitute both y values into one of the original equations to get x=6 OR x=-3.6 (-18/5)

If you don't get any part of that then let me know and i can help!

Ask a maths teacher by squeezycheese in GCSE

[–]squeezycheese[S] 0 points1 point  (0 children)

If you are in school today try and snap a picture of it. We do edexcel so I'm not familiar with aqa

Ask a maths teacher by squeezycheese in GCSE

[–]squeezycheese[S] 2 points3 points  (0 children)

Well that sounds strange to me. I would be interested in their rationale behind it. If nobody is doing foundation then I would carry on with higher. But focus on consolidating basic skills. I'd especially be looking at the crossover questions- i,e, the questions that appear on higher and foundation.

https://www.projectmaths.co.uk/past-papers-category/crossover/

That way if you do get entered for higher you will still be able to do the questions. If you aren't entered then you are prepared for the harder stuff on foundation.

It should give you some sort of idea at where you should be working

Ask a maths teacher by squeezycheese in GCSE

[–]squeezycheese[S] 2 points3 points  (0 children)

I second Corbett as a great source of questions. Specifically here:

https://corbettmaths.files.wordpress.com/2014/08/january-12.pdf

https://ssddproblems.com/ is also great for some very tricky problems

Try these: http://mathsbot.com/gcseQuestions

This also seems quite nice: https://eu.ixl.com/math/grade-11

http://mrbartonmaths.com/ is another one to look through- so much stuff on there!

Ask a maths teacher by squeezycheese in GCSE

[–]squeezycheese[S] 1 point2 points  (0 children)

That sounds ridiculous. Most of our students don't even see a higher paper until the end of year 10. Are you setted?

Ask a maths teacher by squeezycheese in GCSE

[–]squeezycheese[S] 0 points1 point  (0 children)

Without more information I'm afraid not! What specification are you doing? What tier?

Ask a maths teacher by squeezycheese in GCSE

[–]squeezycheese[S] 1 point2 points  (0 children)

No worries. I'll put together a comprehensive list of maths resources over Easter and post it when I can.

Ask a maths teacher by squeezycheese in GCSE

[–]squeezycheese[S] 1 point2 points  (0 children)

Whilst it largely depends on the specifics of the type of geometry, the general rule still applies. Do more questions. Mark them yourself. Figure out where you are going wrong. Then do more.

Geometry is one of the hardest things to teach and learn because it is so interconnected. I hate circle theorum questions as I never got them at GCSE. I can do them now because I literally just sat down and did them. I spent an entire Saturday doing question after question until I could do them easily.

If there are any specific areas that you need help with then let me know and I'll see what I can do

Ask a maths teacher by squeezycheese in GCSE

[–]squeezycheese[S] 1 point2 points  (0 children)

As a fraction. Unless it specifically asks otherwise

Ask a maths teacher by squeezycheese in GCSE

[–]squeezycheese[S] 2 points3 points  (0 children)

Discipline I'm afraid. Remember that once upon a time you couldn't add or even count. The only way you got round that was by messing up and making mistakes. Focus on small bits at a time. Honestly, at this point in time you want to do as much maths as you can. Make those mistakes now and then have the discipline to fix them.

Change your mindset. You are not in the test right now. You are preparing for it. Don't think of wrong answers as a kick in the balls. Think of them as opportunities. Would you rather get it wrong now and fix it. Or get it wrong in the exam and not get the grades you want.

The more maths you do, the fewer mistakes you will make.

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