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What is [(x+1)/(3x^(2)-3)] - [1/(3x+1)] in its simplest form?

First simplify the expression; 3x^(2)-3 to get;

[(x+1)/3(x^(2)-1)] - [1/(3x+1)] 

Using the fact that x^(2)-1 is the difference of two squares, we can simplify it to;

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FO
10329 Views

x = 2t + 5, y = 3 + 4/t. a) Find dy/dx at (9.5) and b) find y in terms of x.

This is a standard parametric equations question, it is important that the methodology behind answering this question is understood.

For part a) we simply use the chain rule (dy/dx = dy/d...

JT
Answered by Jonathan T. Maths tutor
10368 Views

You put £800 in a bank account, which earns you 3.5% compound interest per year. How much interest would you have earned after seven years?

We start with £800 in the bank. As we are earning compound interest, it means that each year we get 3.5% of the original £800, plus 3.5% of any interest that has already been earned...

PM
Answered by Philippa M. Maths tutor
5079 Views

For the curve f(x) = 2x^3 - 54x, find the stationary points and state the nature of these points

Firstly, find the values of x where f'(x) = 0

f'(x) = 6x2 - 54

6x2 - 54 = 0

6(x+3)(x-3) = 0

x = 3, y = -108 and x = -3, y =...

RW
Answered by Ruby W. Maths tutor
4622 Views

Solve the simultaneous equations (1) 2a - 5b = 11 (2) 3a + 2b = 7

(1)x2 4a - 10b = 22(2)x5 15a + 10b = 35(1) + (2) 19a = 57a = 3sub a = 3 into (1)2(3) - 5b = 116 - 5b = 11-5b = 55b = -5b = -1

HC
Answered by Hannah C. Maths tutor
9156 Views

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