Question

resolva... x² - 9x + 8 = 0

Answer 1

Vamos lá:
x² - 9x + 8 = 0
Δ=b²-4.a.c
Δ=(-9)²-4.1.8
Δ=81-32
Δ=49

x=-b+-√Δ /2.a
x=-(-9)+-√49/ 2
x=+9+-7/2
x1=16/2=8
x2=2/2=1

Espero ter te ajudado!

Answer 2

Delta= (9)^-4.1.8
81-32
49

X=9+-7/2
X'=9+7/2= 16/2= 8
X"=9-7/2= 2/2=1