Question

How do you multiply `(x + 3)(x - 7)`?

Answer 1

`=color(blue)(x^2 - 4x -21`

Explanation:

`color(green)( (x+3)).(x-7)`
`=color(green)( (x)).(x-7)+ color(green)((3)).(x-7)`

`= x^2 - 7x +3x -21`
`=color(blue)(x^2 - 4x -21`