Question

resolva as equações do 2 grau usando a formula geral.

a) x² - 6x + 9 = 0

b) - x² + x + 12 = 0

c) 7x² + x + 1 = 0

d) x² - x - 1 = 0

e) x² - 4x + 3 = 0

f) x² + x - 20 = 0

Answer 1

a) a= 1 b= -6 c=9
Δ=b²-4ac
Δ=(-6)²-4.1.9
Δ= 36-36
Δ=0
x= -b+-√Δ $\\ 2.a$
x= -(-6) +-√0 ÷ 2.1
x= 6 +-0 ÷2
x= 6÷2
x'= 3