Question

Raiz de f(x)=c)f(x)=-x²+3x

Answer 1

f(x) = x² + 3x

x² + 3x = 0
a = 1
b = 3
c = 0

Δ = b² - 4.a.c
Δ = 3² - 4.1.0
Δ = 9 - 0
Δ = 9

-b +- √Δ / 2.a
-3 +- √9 / 2.1
-3 +- 3 / 2

x' = -3+3/2 = 0/2 = 0
x'' = -3-3/2 = -6/2 = -3

As raízes são 0 e -3.

Answer 2

x=fecha x²+3x= r8. espero ter ajudado