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Solve this quadratic equation: x^2 = 81

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x = ( + - ) 9

Step-by-step explanation:

x^2 = 81

u know how u can sometimes cancel something out by doing the opposite.

This is one of those times as well. the opposite of ^2 = square root.

so if we take the square root of both sides, this will cancel out the^2 on the left side.

sqrt (x^2) = sqrt (81)

x = (+-) 9 ... thats a positive and a negative sign ... because the sqrt of 81 is both 9 and - 9.