Question

Quais os zeros da função f(x)=x² -7x-8 ?​

Answer 1

Resposta:

X1=-1;. X2=8

Explicação passo-a-passo:

a=1 b=-7 c=-8

∆=b²-4ac

∆=-7²-4×1×(-8)

∆=49+32

∆=81

X1=-b+√∆/2×a

X1=-(-7)+√81/2×1

X1=7+9/2

X1=16/2

X1=8

X2=-b-√∆/2×a

X2=-(-7)-√81/2×1

X2=7-9/2

X2=-2/2

X2=-1