Question

A soma das raízes da função f(x)=x²-5x-6, é:
A) -5;
B) 6;
C) -6;
D) 5.
E) 1.

Answer 1

Resposta:

f(x)=x²-5x-6

a= 1 b= -5 c = -6

delta = b²- 4a*c

delta = -(5)² - 4*1*-6

delta = 25-24

delta = 1

x= -b+/-raizdedelta/2*a

x1= -(-5) + 1 / 2 = 6/2 = 3

x2 = -(-5) -1 / 2 = 4/2 = 2

x1+x2 = 3+2 = 5

D) 5.