Question

Resolva as equaçoes incompletas do 2 grau: a) x²-8=0 b)x²-49=0 c) 2x²-50=0 d)3(x²-1)=24

Answer 1

Olá

a) x² - 8 = 0

x² = 8

x = +- √8

x = +- 2√2

S ={x' =2√2 e x" = - 2√2}

b) x² = 49 = 0

x² = 49

x = +- √49

x = +- 7

x' = 7

x" = -7

S={x'=7 e x" = - 7}

c) 2x² - 50 = 0

2x² = 50

x²= 50/2

x² = 25

x = +-√25

x = +- 5

x' = 5

x" = - 5

S={x'=5 e x" = -5}

d) 3(x² - 1 )= 24

3x² - 3 = 24

3x = 24 + 3

3x = 27

x = 27/3 ÷ 3

x = 9

Bons esudos