Question

Solve by factoring p^2-4p=21

Answer 1

solve by factoring

`p^2-4p=21`

A.
`p = (1)/(2), or 21`

B.
`p = 3, or 7`

C.
`p = -3, or 7`

D.
`p = 3, or -7`

The Answer is C... p = -3, or 7

Answer 2

`p^2-4p=21 \\ p^2 - 4p-21 = 0` - set the equation equal to 0

`(p + 3)(p-7) = 0` - factor

`p +3=0 \\ p=-3` - one answer

`p-7 = 0 \\ p=7` - Second answer