Question

6. Multiply: (x – 4)(x + 5)

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Answer 1

`x^2+x-20`

Explanation:

1) Use the FOIL method:
`(a+b)(c+d)=ac+ad+bc+bd.\\`

`x^2+5x-4x-20`

2) Collect like terms.

`x^2+(5x-4x)-20`

3) Simplify.

`x^2+x-20`

What is the FOIL method

It stands for:

First, Outside, Inside, Last

Answer 2

x^2+x-20

Explanation:

(x-4)(x+5)

=x^2-4x+5x-20

=x^2+x-20

Hope This Helped