Question

dada a funçaõ f(x)=-2.(x+1).(2-x). determine as raizes, para f(x)=0

Answer 1

Oie, Td Bom?!

$f(x) = - 2(x + 1) \: . \: (2 - x)$

$0 = - 2(x + 1) \: . \: (2 - x)$

$- 2(x + 1) \: . \: (2 - x) = 0$

$(x + 1) \: . \: (2 - x) = 0$

$x + 1 = 0 \\ 2 - x = 0$

$x = - 1 \\ x = 2$

S = $\left \{ x_{1} = - 1 \: , \: x_{2} = 2 \right \}$

Att. Makaveli1996