Question

valor da equacao de segundo grau  

x2-8x+7= 0

Answer 1

x² - 8x +7=0
Δ=b²-4 ac
Δ= (-8)² -4.1.7
Δ=64 - 28
Δ=36

x= -b +/- √Δ / 2a
x= $\frac{- (-8) +/- \sqrt{36} }{2.1}$
x'= $\frac{8+6}{2}$
x'= $\frac{14}{2}$
x'= 7

x''= $\frac{8-6}{2}$
x''= $\frac{2}{2}$
x''=1

Espero ter ajudado!