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In $43-46,$ solve each equation for the variable.$$x^{2}=81$$

$\{-9,9\}$

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Chapter 3

REAL NUMBERS AND RADICALS

Section 2

Roots and Radicals

Whole which of Numbers

Fractions and Mixed Numbers

Decimals

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In $43-46,$ solve each equ…

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Solve each equation.$$…

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Solve each equation. $…

Solve each equation for $x…

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Well, all right. We are asked to solve the equation. X squared equals 81. All right, To do this, we should write. 81 is a perfect square. 81 is the same thing is nine squared. Now that we have perfect squares on both sides of the equation, weaken square root both sides of the equation. Since where roots and squares are in verses, they cancel each other out. So the square root of X squared is X, and the square root of ah, nine squared is nine. No, don't forget the square root property that is not just nine. When we square root a positive number, it is the positive and negative value of it. So the square root of 81 is nine or negative. Nine. We're gonna write it in set notation. Negative. Nine and nine.

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