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# plz help

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Find all real values of that satisfy the equation (x^2 - 81)^2 = 324. If you find more than one, then list the values separated by commas.

Dec 9, 2021

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Find all real values of that satisfy the equation.

Hello Guest!

$$(x^2 - 81)^2 = 324\\ x^2 - 81=18\\ x=\pm \sqrt{99}\\ x^2 - 81=-18\\ x=\pm \sqrt{63}$$

$$x\in \{-\sqrt{99},-\sqrt{ 63 },\sqrt{63},\sqrt{99}\}$$

!

Dec 9, 2021