Question

(a+3)(a+3)=a*-9 correto?

Answer 1

a2+3a+3a+9
a2+6a+9=0

(Delta)= 6(elevado à 2) - 4×1×9
(Delta)= 36-36
(Delta) = 0

X= (-6 +_ (raiz Quadrada) 0)/2
X= (-6 +_ 0)/2
X= -6/2
X= -3