Question

Calcule o valor de f(x)=x²-2x-35 para que f(x)=0

Answer 1

vamos lá...

f(x)=x²-2x-35      se f(x)=0

x²-2x-35=0

a=1
b=-2
c=-35

Δ=b²-4ac
Δ=(-2)²-4(1)(-35)
Δ=4+140
Δ=144

x=(-b±√Δ)/2a=[-(-2)±√144]/2=(2±12)/2

x'=(2+12)/2=14/2=7
x"=(2-12)/2=-10/2=-5