Question

O valor de a de modo que P(a) =0 no polinômio P(x)= x² -6x +9, é:
a)4
b)2
c)1
d)3
e)5

Answer 1

$P(x)=x^2-6x+9 \\ \\ P(a)=0 \\ \\ a^2-6a+9=0 \\ \Delta=36-36 \\ \Delta=0 \\ \\ a=- \frac{b}{2a} = \frac{-(-6)}{2} = \frac{6}{2} =3 \\ \\ Letra~~D$