Search our library of Maths GCSE questions

Top answers

Maths

GCSE

What's the quadratic formula used for?

Firstly, it's important to understand what the formula is. It is essentially a re-arrangement of a quadratic equation, however the formula can be learnt so that it can be applied quickly within an exam co...

Answered by James H. • Maths tutor

3506 Views

factorise x^2 - x - 6

Answered in interview

Answered by Kushal C. • Maths tutor

2785 Views

The length of a plank of wood is 80cm to the nearest 1cm. What is the largest and smallest possible value for the actual length of the plank?

Bounds can be used when a value has been approximated. e.g. The length of a plank of wood is 80cm to the nearest 1cmThe lower bound is the smallest value that would round up to the estima...

Answered by Lydia T. • Maths tutor

6023 Views

f(x)=2x^2 -8 What is the value of x if f(x)=0, x>0

This would be a typical B grade GCSE question. Firstly, let's set f(x) to 0 , where now we have 0=2x²-8 . We now need to rearrange to find x. First, move the -8 to the other side of the "=...

Answered by Tutor122314 D. • Maths tutor

4983 Views

Factorise 12x^2 +17x +6

If you imaging the equation as ax^2 +bx +cYou multiply the numbers of a and c together. This number then becomes the product of two numbers that either add or subtract to make the number for b.So 12 x 6 i...

Answered by Amy B. • Maths tutor

9859 Views