Question

resolva as equaçoes do 2 grau
a) 4x²-36x=0
b) 2x²-14+20=0

Answer 1

a) x . (4x - 36) = 0
    x = 0 | ou  x = 0 + 36
    x = 0 | ou  36 / 4 = 9
         
 S = {0,9}

Answer 2

a) x.(4x-36)=0 -> x=0

4x-36=0
4x=36
x=36÷4
x=9 e x=0


b) 2x²-14+20=0
∆=(-14)²-4.2.20
196-160
∆=36

x=14+6÷4=5
x=14-6÷4=2
x=2 e x=5