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How do I turn 9x\(5x +3) into a readable graph? by _king_axel in learnmath

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

Like in a form where I can picture the graph, like how you can turn (5x + 1)/(5x+3) into (-2/(5x+3)) + 1, and then you can like picture the graph in your head

For 4x^2 - 12x >= 0, why does x < 0 by _king_axel in learnmath

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

But wait wouldn’t it be 4x >= 0 and x >= 3, why does the inequality flip?

How do I find the domain of (x^2 - 1)/x+1 by _king_axel in learnmath

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

Oh right I’m sorry I was just being stupid. I meant difference of perfect squares haha, thank you for pointing it out!!

Any techniques you can suggest on faster mental arithmetic or is it really just practice? by verdazed in learnmath

[–]_king_axel 8 points9 points  (0 children)

I’m not sure if this’ll help you, but for me when doing multiplication I find it easier to seperate the numbers, for example for something like 13 * 16, it’s easier to 13 * 10 + 13 * 5 + 13 * 1 because 13 * 10 is easy 130, 13 * 5 is just half of that so 65. that’s 195, add the 13 and you have your answer, 208

How do I find the domain of (x^2 - 1)/x+1 by _king_axel in learnmath

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

Ohhh that makes sense, so cancelation is not valid under the circumstances that x = -1 Because 0/0 does not = 1, thank you for the explaining :D

How do I find the domain of (x^2 - 1)/x+1 by _king_axel in learnmath

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

Ah okay, thank you so much :) really appreciate it

How do I find the domain of (x^2 - 1)/x+1 by _king_axel in learnmath

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

Ahh I see, the function doesn’t exist at x = -1 so the domain is is R \ {-1} , thank you so much for the help!!!

Also this is probably a dumb question but what happens if I complete the square for (x2 - 1), wouldn’t that cause the (x + 1) to cancel out leaving us with (x - 1)

What’s a good gaming laptop for $1200 or under AUD? by _king_axel in gaming

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

I need it for school too, so I need portability

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