Search our library of Maths GCSE questions

Top answers

Maths

GCSE

solve 2^(3x+1)=16

The first step is to make sure that everything has the same base, so you can equate the powers. For example if you have an equation 2²= 2^x you know that x must equal 2. So with this...

Answered by Jessica P. • Maths tutor

5275 Views

L is a line parallel to 4x-2y=8. Find the equation of the line if L passes through (4,(38/3))

Since L is parallel to 4x-2y=8, it means that both lines have the same gradient. (Reminder: in y=mx+c, m is the gradient)4x-2y=8, therefore 2y=4x-8, and dividing both sides by 2 results to y=2x-4. Therefo...

Answered by Demetris I. • Maths tutor

3457 Views

Expand and simplify (x+4)(x+5).

First, we need to expand the brackets out. To do this first times the x term in (x+4) by everything in the other brackets. We need to make sure to do this term by term. This will give us x^2+5x. Next, we ...

Answered by Peter G. • Maths tutor

9644 Views

Rectangle ABCD has sides 2x+5 and x+2 with rectangle EFGH of sides x+3 and x cut out of it. The total area of shape ABCD is 5cm^2. Show that 0 = x^2 + 6x +5 [5 Marks]

Area of ABCD = (2x+5)(x+2) = 2x² +9x +10Area of EFGH = (x+3)(x) = x² + 3xTotal Area = 5 = ABCD - EFGH = 2x² +9x +10 - x² - 3x 5 = x² + 6x +10 0 = x

Answered by Arad S. • Maths tutor

2693 Views

How do you factorize a quadratic when a ≠ 1 when ax²+bx+c=0

First check if a, b and c all have a common factor.For example, if we have 3x²+6x+3=0, we can divide both sides by 3 and get x²+2x+1=0, which is easier to solve.If a,b and c do not all have a common facto...

Answered by Gabriel Thomas N. • Maths tutor

3708 Views