Question

Resolva essa equação x²-18x+77=0

Answer 1

Boa noite, tudo bem?
Estou enviando as respostas.
blz

Answer 2

x²-18x +77=0

a=1
b=-18
c=77

Δ=b²-4ac
Δ=(-18)²-4(1)(77)
Δ=324-308
Δ=16

$x= \frac{-b\pm \sqrt{\triangle} }{2a} = \frac{-(-18)\pm \sqrt{16} }{2(1)} = \frac{18\pm4}{2} = \\ \\ x'= \frac{18+4}{2} = \frac{22}{2} =11 \\ \\ x"= \frac{18-4}{2} = \frac{14}{2} =7$