Search our library of GCSE questions

Top answers

All subjects

GCSE

Simplify (x + 3)(2x + 5) - (x - 1)

Start by expanding the brackets: 2x^2 + 5x + 6x + 15 = 2x^2 +11x + 15 Combine the two parts of the equation: 2x^2 + 11x + 15 - x + 2 = 2x^2 + 10x + 17

Answered by Hannah M. • Maths tutor

4538 Views

Fully simplify: (y^2 x y^5) / y^3

(y²x y⁵) / y³ When multiplying, the indices must be added together, therefore y² x y⁵ = y²⁺⁵ = y⁷ (y²x y⁵

Answered by Jemima P. • Maths tutor

5440 Views

Increase £160 by 45%.

If £160 = 100%, the number we are trying to find (let's call this X) equals 145%. (Place numbers in 2x2 grid) 100% £160 145% X Multiply the two diagonal numbers together, then divide by the number ...

Answered by Jemima P. • Maths tutor

4682 Views

Simplify: 2x + 6y + 2y - x

Collect like terms 2x - x +6y +2y 2. Simplify like terms 2x - x = x 6y+2y=8y 3. Write final answer x + 8y

Answered by Noureen L. • Maths tutor

3799 Views

A man has a disease caused by a dominant allele. The mother has the disease but the father does not, explain how we know the man is heterozygous for this disease.

So first we must gather the informaton, the disease is caused by a dominant allele, we may call this 'D', the recessive could therefore be 'd'. The mother has the disease, but the father does not. Therefo...

Answered by Lucas C. • Biology tutor

3366 Views