Question

" align="absmiddle" class="latex-formula">
​

Answer 1

Answer:

$x^{2}$ + 40x + 400

Step-by-step explanation:

$(x + 20)^{2}$

(x + 20)(x + 20)

(x)(x) + (x)(20) + (20)(x) + (20)(20)

$x^{2}$ + 20x + 20x + 400

$x^{2}$ + 40x + 400