Question

1) Resolva as equações do 2 Grau

a) x² = 60 – 4x²

b) 3(x² - 1 ) = 24

c) 2(x² - 1) = x² + 7

d) 5(x² - 1) = 4(x² + 1)

e) (x – 3)(x + 4) + 8 = x

Answer 1

Resposta:

Explicação passo-a-passo:

A) x² = 60 – 4x²

x^2+4x^2=60

5x^2=60

x^2=12

x= +-$2\sqrt{3$

B) 3(x² - 1 ) = 24

x^2-1=8

x^2=8+1

x^2=9

x=+- 3

x=-3

x=3

C) 2(x² - 1) = x² + 7

2x^2-2=x^2+7

2x^-x^2=7+2

x^2=7+2

x^=9

x=+- 3

x= -3

x= 3

d) 5(x² - 1) = 4(x² + 1)

5x^2-5=4x^2+4

5x^2-4x^2=4+5

x^2=9

X=+-3

x=-3

x=3

e) (x – 3)(x + 4) + 8 = x

x^2+4x-3x-12+8=x

x^2+x-4=x

x^2-4=0

x^2=4

x=+-2

x=-2

x=2

ESPERO TER AJUDADO