Question

resolva as equações do segundo grau:

Answer 1

A)4x²-36=0

4x²=36

x²=36/4

x²= 9

x=√9

x=3

B)5x²-20=0

5x²=20

x²=20/5

x²= 4

x=√4

x=2

C) x²-7x+10=0

a:1

b:-7

c:10

Δ = b2 – 4ac

Δ = (-7)² -4.1.10

Δ = 49 -40

Δ = 9

x = – b ± √Δ  / 2.a

x = – (-7) ± √9 / 2

x=7 ± 3/2

x1= 7+3/2

x1=10/2

x1= 5

x2=7-3/2

x2= -4/2

x2= -2