Question

$(a + 2) * (a + 2)$

Answer 1

(a+2)(a+2)
a²+2a+2a+4
a²+4a+4

Answer 2

$(a+2).(a+2)\\ a.a+a.2+2.a+2.2\\ a^2+2a+2a+4\\ a^2+4a+4$

Achamos uma equação do 2º grau
Usaremos as fórmulas: $x= \frac{-b+- \sqrt{\Delta} }{2.a} \\\\ \Delta=b^2-4.a.c$

$\Delta=4^2-4.1.4\\ \Delta=16-16\\ \Delta=0$

$x= \frac{-4+- \sqrt{0} }{2.1}\\\\ x= \frac{-4+-0}{2}\\\\ x'= \frac{-4+0}{2}\\\\ x'= \frac{-4}{2}\\\\ x'=-2\\\\ x"= \frac{-4-0}{2}\\\\ x"= \frac{-4}{2}\\\\ x"-2\\\\ V=\{-2\}$