Question

formula: b2-4.a.c
equação:
x2-8x+7=

Answer 1

x² - 8x + 7 = 0


∆ = b² - 4.a.c


∆ = (-8)² - 4.1.7
∆ = 64 - 28
∆ = 36


x = -b ± √∆/2.a

x = -(-8) ± √36/2.1

x = 8 ± 6/2

x = 8 + 6/2 = 14/2 = 7

x = 8 - 6/2 = 2/2 = 1


S={ 7, 1 }