Question

quem sabe ? ײ-7×+12=0

Answer 1

x² - 7 x + 12 = 0
Δ = b² - 4 . a . c
Δ = (-7)² - 4 . 1 . 12
Δ = 49 - 48
Δ = 1
\/¨1 = 1
x = - b +ou- 1/2.1
x = -(-7) +ou- 1/2
x´= 7 + 1/2
x´= 8/2
x´= 4
x" = 7 - 1/2
x" = 6/2
x" = 3
S = {3 e 4 }