Question

What is the factor for x^2-4x-21

Answer 1

Hey there Alissia!

$\Longrightarrow \left[\begin{array}{ccc}\boxed{\boxed{ Factoring \ x^2-4x-21 }}\end{array}\right] \\ \\ \Longrightarrow \left[\begin{array}{ccc}\boxed{\boxed{Multiply \ the \ coefficient \ of \ the \ first \ term \ by . . . . .}}\end{array}\right] \\ \\ \ \ \ \ \ \Longrightarrow \boxed{ by \ the \ constant \ ( 1 * -21 = -21) } \\ \\ \left[\begin{array}{ccc} Add \ up \ the \ four \ terms \ of step \ 4 \\ \\ (x+3) * (x-7) \\\end{array}\right]$

$(Final \ result) \\ \\ \Longrightarrow (x + 3) * (x - 7) \Longleftarrow \\ \\ Hope \ this \ help \ you!$

Answer 2

(x+7) (x-3) is the anwer