Question

resolva as equaçoes de 2 grau

a) ײ - 14 × + 49 = 0

b) ײ - 14 × + 45 = 0

c) ײ - 10 × + 16 = 0

d) ײ + 7 × + 10 = 0

Answer 1

a) ײ - 14 × + 49 = 0
Δ=(-14)^2-4.1.49
Δ=196-196
Δ=0

calculando as raizes
x'=14+0/2
x'=7

x"=14/2=7

b) ײ - 14 × + 45 = 0
Δ=(-14)^2-4.1.45
Δ=196-180
Δ=16

calculando as raizes
x'=14+4/2
x'=9

x"=14-4/2=5


c) ײ - 10 × + 16 = 0
Δ=(-10)^2-4.1.16
Δ=100-64
Δ=36

calculando as raizes
x'=10+6/2
x'=8

x"=10-6/2=2

d) ײ + 7 × + 10 = 0
Δ=(-7)^2-4.1.10
Δ=49-40
Δ=9

calculando as raizes
x'=7+3/2
x'=5

x"=7-3/2=2