Question

Como resolve essa questãããããão

5.(x² - 1) = 4.(x² + 1)

Answer 1

Resposta:

x = ±3

Explicação passo a passo:

$5(x^{2}-1)=4(x^2+1)\\\\x^2-1=\frac{4}{5}(x^2+1)\\\\x^2=\frac{4}{5}x^2+\frac{4}{5}+1\\\\x^2-\frac{4}{5}x^2=\frac{4}{5}+\frac{5}{5}\\\\\frac{x^2}{5}=9/5\\\\x^2=9\\\\x=+-3$