Question

As coordenadas do vértice da parábola na função f(x) = x² -8x + 6 são:
a) 1 e -8
b) 1 e 6
c) 8 e 6
d) 4 e -10

Answer 1

$\begin{array}{l}x_{v} =\frac{-b}{2a} =\frac{8}{2\cdotp 1} =4\\\\y_{v} =f( x_{v}) =f( 4) =4^{2} -8\cdotp 4+6\Longrightarrow y_{v} =-10\\\\\therefore \boxed{\boxed{V( 4,-10)}}\end{array}$

Resposta

D