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Solve: 7x - 20 = 3x + 4

7x = 3x + 24 4x = 24 x = 24/4 x = 6

AG
Answered by Alex G. Maths tutor
2478 Views

Find the integral between 1 and -2 for (4-x^2-3x^3)

= [4x - 1/3x3 - 3/4x4]1-2 = (4(1) - 1/3(1)3 - 3/4(1)4) - (4(-2) - 1/3(-2)3 - 3/4(-2)4) =(2 11/12) - (-8 + 8/3 - 12) ...

AG
Answered by Alex G. Maths tutor
3055 Views

(x + 2)(x + 3)(x + 6)

First: (x + 2)(x + 3) = x2 + 5x + 6

Second: (x2 + 5x + 6)(x + 6) = x+ 5x2 + 6x + 6x2 + 30x + 36 = x3 + 11x2 + 36x +36<...

UC
Answered by Urma C. Maths tutor
2624 Views

Integrate xcos(x) with respect to x

In order to do this question one has to first recognise that this is a product and thus has to be solved using Integration by parts. Firstly write out the formula: ∫u.dv/dx dx = uv - ∫v. du/dx dx ...

DW
Answered by David W. Maths tutor
4318 Views

2x + y = 12. P = xy^2. Show that P = 4x^3 - 48x^2 + 144x

We want to make P = xy^2 into something more complicated, which only has Xs, and no Ys. 

Firstly, you need to remember that when there are two equations, the question will almost definitely involve...

JR
Answered by Jethro R. Maths tutor
3320 Views

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