Search our library of Maths GCSE questions

Top answers

Maths

GCSE

Solve these simultaneous equations.....3a+2b = 17 and 8a-2b= 60

3a+2b = 178a-2b = 60We are going to solve this using the elimination method. This means that we are going to eliminate the variable (or letter) that has the same value in each equation. In this case it is...

Answered by Joel O. • Maths tutor

5503 Views

Solve the equation x^2 + 10x + 24 = 0

x² + 10x + 24 = 0
First we must factorise the equation, which means put it into brackets. To do this we must find two numbers which multiply to equal 24 and add together to make 10. The on...

Answered by Archie A. • Maths tutor

11618 Views

Sophie had 3 piles of coins, A, B and C. Altogether there was £72. Pile B had twice as much as pile A. Pile C had three times as much as pile B. How much money was in Pile C?

A + B + C = £722A = B3B = C0.5 B + B + 3B = £724.5 B = £72B = £16C = £48

Answered by Saleema R. • Maths tutor

2729 Views

Express x^2+2x+4 in the form (x+a)^2 + b, hence find the stationary point of the curve.

Step 1) x²+2x+4 = (x+1)²+3Step 2) Minimum point occurs at (-1, 3)
I can use the whiteboard to explain it better.

Answered by Anton N. • Maths tutor

6326 Views

Work out the equation of the tangent to a circle of centre [0,0] at the point [4,3]

We know that: (1) the radius of the circle to the point [4,3] is perpendicular to the tangent line, (2) if two lines are perpendicular, their gradients are negative reciprocals of each other, and (...

Answered by Jamie S. • Maths tutor

7262 Views