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Maths
GCSE

What is Pythagoras' Theorem and how is it used in exam questions?

Pythagoras' Theorem is an equation used to give us more information about right angled triangles. The theorem itself looks like this: a2

TD
Answered by Tutor96690 D. • Maths tutor
2949 Views

Solve the simultaneous equation 2x-4y=8 and 3x+3y=-15

Set 2x-4y=8 as equation 1, and 3x+3y=-15 as equation 2. Multiply equation 1 by 3 and equation 2 by 4 so they look like 6x-12y=24 and 12x+12y=-60. Now add the two equations and you get 18x=-36 or x=-2. Sub...

DL
Answered by Daniel L. • Maths tutor
3724 Views

If Q = P / (R (4 – t)), calculate the value of Q when P = 36, R = 3 and t = –2

So seeing as you are given the values for P, R and t, the first thing you need to do is substitute the letters for their given numbers into the equation: Q = (36) / ((3)(4 - (-2)) Now expand out the b...

RB
Answered by Rosie B. • Maths tutor
4092 Views

Write x/(x-1) - x/(x+1) as a single fraction in its simplest form (Edexcel GCSE 2016)

The key concept to answering this question is to notice that you need a common denominator for both fractions in order to subtract and simplify them. Clearly the two denominators: (x-1) and (x+1) are not ...

FK
Answered by Fritz K. • Maths tutor
9186 Views

1/7 + 5/3x

1 x 3x / 7 x 3x + 5 x7 / 3x /7

= 3x/21x + 35/21x

= 3x + 35 / 21x 

RC
Answered by Rachel C. • Maths tutor
3339 Views

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