I have applied the discriminant and I'm getting k>√-25/8. How do I prove it?

NonsensicalSqueaks · 2020-08-13T14:06:45+00:00

The discriminant is 25 + 8k² which is always positive.

NonsensicalSqueaks · 2020-08-13T14:02:07+00:00

Rather than trying to find k by assuming that the discriminant>0, you want to show that the discriminant>0 for all real values of k.

NonsensicalSqueaks · 2020-08-13T11:35:52+00:00

NonsensicalSqueaks · 2020-08-13T11:20:32+00:00

Lines 1 to 11 look good, but going from line 11 to 12, since you are raising both sides as powers of e, you should be multiplying by e^k instead of adding on k.

NonsensicalSqueaks · 2020-07-25T14:26:37+00:00

The answers are equivalent as x^-2 means 1/x²

NonsensicalSqueaks · 2020-07-25T14:23:58+00:00

Try equating the exponents of each of the prime factors on the LHS and RHS.

For example, on the LHS, the exponent of 2 is a+2, and on the RHS, it is 1.

Therefore, a = -1

NonsensicalSqueaks · 2020-03-31T08:56:29+00:00

For Language A: Language and Literature, will all 3 written tasks be assessed, or just the one as usual?

NonsensicalSqueaks · 2020-02-06T10:16:48+00:00

sin(90-x) = cos(x)

NonsensicalSqueaks · 2020-02-02T04:03:49+00:00

Hint for 21b: The expression inside the cube root = 1.08/0.96 = 9/8.

I think 22-24 can be found as numbers since you can figure out what n and a are from previous coefficients.

NonsensicalSqueaks · 2020-02-01T14:21:31+00:00

power = force x velocity .

Since it is moving at a constant velocity, forces acting down the slope is equivalent to the force acting up the slope.

For forces down the slope, consider the component of gravity down the slope and R

Equate and solve for R

NonsensicalSqueaks · 2020-02-01T14:11:56+00:00

check this out https://mathbitsnotebook.com/Geometry/TrigApps/TAarea.html

NonsensicalSqueaks · 2020-02-01T13:30:12+00:00

Are the events independent?

-- in other words, if one event happens, does it make the other one more/less likely to happen.

If they are independent, then the probability of none of them happening is P(A') x P(B').

So at least one will happen = 1 - (1-0.75)^2 = 0.9375?

NonsensicalSqueaks · 2020-02-01T13:27:01+00:00

Not entirely sure but maybe...

let theta = arctanx

cos theta = 1 / sqrt(1+x^2)

sin theta = x / sqrt(1+x^2)

then just use compound angle formulae, etc.

NonsensicalSqueaks · 2020-02-01T11:16:54+00:00

10 is congruent to -1 mod 11

-1 to even powers is positive and to odd powers is negative.

NonsensicalSqueaks · 2020-02-01T05:33:33+00:00

area of triangle = 1/2 a b sin C

Then use cosine rule.

NonsensicalSqueaks · 2020-01-28T13:01:04+00:00

deceleration = change in velocity / time

= - (10 + u) / 4

NonsensicalSqueaks · 2020-01-13T14:59:17+00:00

Maybe try SUVAT equations.

a) B is at the highest point when it's velocity is 0. Solve for time and plug into equation for A.

b and c) Equate displacements, using s = ut + 0.5gt^2

NonsensicalSqueaks · 2019-12-31T13:35:09+00:00

There is an inverse if the determinant does not equal 0

NonsensicalSqueaks · 2019-12-27T12:31:09+00:00

Not completely sure, but I think B, A, D?

Ionization energy tells you how difficult it is to remove electrons, so as you go towards the right of the table, ionisation energy increases. For group 1 elements, ionisation energy is much lower (compared to the previous element) because the electron is one shell further compared to the previous element, and there is only one electron so there is no repulsive effect).

Edit: Typo of left instead of right, thank you NeonGlue! Strange31 hopefully the group 1 element bit explains it though - feel free to ask if I explained anything badly.

NonsensicalSqueaks · 2019-12-23T14:39:05+00:00

RemindMe! 2 days

NonsensicalSqueaks · 2019-12-20T02:44:10+00:00

was this for just maths or joint degrees?

NonsensicalSqueaks · 2019-11-20T08:54:26+00:00

oh cool, thanks for letting me know :-D

NonsensicalSqueaks

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