Question

f(x)=-x2+4x funçao polinomial do 2 grau

Answer 1

$- x^{2} + 4 x = 0 =\ \textgreater \ - x^{2} = -4x (-1) =\ \textgreater \ \frac{ x^{2} }{x} = 4 =\ \textgreater \ \frac{x * x}{x} = 4 =\ \textgreater \ x =4$

Answer 2

F(x)= -x^2+3x
-x^2+3x=0
a= -1; b=4; c=0
/\= delta.
/\= b^2-4ac
/\= (4)^2-4(-1)(0)
/\= 16+0
/\= 16

-b+/- raiz de /\ = -4+/- raiz de 16
2a. 2(-1)
-4+/- 4= x'= 0; x''=4
-2