Question

Producer of gn="absmiddle" class="latex-formula">

Answer 1

Answer:

(x - 7)(x + 3)

Explanation:

$\rightarrow \sf x^2 - 4x - 21$

breakdown

$\rightarrow \sf x^2 - 7x +3x- 21$

factor out common terms

$\rightarrow \sf x(x - 7) +3(x- 7)$

collect into groups

$\rightarrow \sf (x+3)(x- 7)$