Question

X ao quadrado +10x-1=74

Answer 1

Δ=b²-4*a*c
Δ=10²-4*1*(-75)
Δ=100+300
Δ=400
√Δ=√400
√Δ=20

x=$\frac{-10+-20}{2*1}$

x´=$\frac{-10+20}{2}$
x´=10/2=5

x´´=$\frac{-10-20}{2}$
x´´=-30/2=-15

logo,  V={-15,5}