Question

resolva a equação do 2° grau x²-8x+7=0

Answer 1

B= -8
A=1
C=7
Δ=B²-4.A.C
(-8)²-4. 1.7=64-28⇒Δ=36
X= -B+-√Δ/2.A
X= -(-8)+-√36 /2.1
X= 8+-6/2
X'=8+6/2=7
X"= 8-6/2=1