# How do you find the product of #(d-7)(d+7)#?

##### 1 Answer

Dec 23, 2016

#### Explanation:

It helps if you can learn to recognise that these are the factors for:

If you do not recognise them, so can just multiply out the brackets.

Each term in the first bracket multiplies by each term in the second bracket to get 4 terms.

Simplify to get