Se f(1 + x) = x x² - 1 então f(4) vale?.... Pergunta de ideia deDeborahfelicio

April 2020 1 59 Report

Se f(1 + x) = x
x² - 1
então f(4) vale?

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lamacch F(1 + x) = $\frac{x}{ x^{2} - 1}$

1 + x = y ⇒ x = y - 1

f(y) = $\frac{y - 1}{ (y-1)^{2} -1 }$

f(4) = $\frac{4 - 1}{ (4-1)^{2} -1 } = \frac{3}{ (3)^{2} -1 } = \frac{3}{ 8 }$

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