Question

d) 5x² - 20 = 0 e) 5.(x² - 1) = 4.(x² + 1)

Answer 1

Resposta:

5x²-20=0

5x²=20

x²=20/5

x²=4

x=√4

x= 2

5(x²-1)=4(x²+1)

5x²-5=4x²+4

5x²-4x²=4+5

x²=9

x=√9

x= 3

Answer 2

Boa tarde!

a) 5x² - 20 = 0

5x² = 20

x² = 20/5

x² = 4

x = √4

x = 2

b)5x²-5=4x²+4

5x²-4x²=4+5

x²=9

x=√9

x=3