Question

resposta 2(x²-1)=x²+7

Answer 1

$\Large\boxed{\begin{array}{l}\sf2\cdot(x^2-1)=x^2+7\\\sf 2x^2-2=x^2+7\\\sf 2x^2-x^2=7+2\\\sf x^2=9\\\sf x=\pm\sqrt{9}\\\sf x=\pm3\\\sf S=\{-3,3\}\end{array}}$

Answer 2

Resposta:

Olá,

$\boxed{\begin{array}{lr}2(x^2 - 1) = x^2 + 7\\2x^2 - 2 = x^2 + 7\\2x^2 - 2 - (x^2 + 7) = 0\\2x^2 - 2 - x^2 - 7 = 0\\2x^2 - 9 - x^2 = 0x^2 - 9 = 0\\x^2 = 0 + 9\\x^2 = 9\\x = \pm\sqrt{9}\\x = 3\\x = -3\end{array}}$

Ω | Ass: Fallen Angel | Ω

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