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

Jan 23, 2016

${x}^{2} + 7 x - 8$

#### 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 :

$x \left(x + 8\right) - 1 \left(x + 8\right) = {x}^{2} + 8 x - x - 8 = {x}^{2} + 7 x - 8$