Question

Usando a formula de bhaskara, encontre as raizes das seguintes equaçoes:
(a) x ²-5+6=0
(b) x²-8+12=0
(c) x²+3x-6=8
(d) x (x+3) - 40=0

Answer 1

c
x² +3x - 6 - 8 = 0
x² + 3x - 14 = 0
delta = 9 + 56 = 65 ou +-V65

x = ( -3 +-V65)/2
x1 =( -3 + V65)/2
x2 = (-3 - V65)/2

d
x² + 3x - 40 = 0
delta = 9 + 160 = 169 = +-V169 = +-13 ***

x = ( -3 +-13)/2
x1 = 10/2 = 5 ****
x2 = -16/2 = -8 ****