Question

What is the standard form of `y=(x – 1)(x + 8)`?

Answer 1

`x^2 + 7x - 8`

Explanation:

To expand these brackets use the 'distributive law '.

This means that each term in the 2nd bracket must be

multiplied by each term in the 1st bracket .

This can be written as follows :

`x(x + 8 ) - 1 (x + 8 ) = x^2 + 8x - x - 8 = x^2 + 7x - 8`