Question

9x2 - 81 = 0 then the value of x is :
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Answer 1

Step-by-step explanation:

$9 {x}^{2} - 81 = 0 \\ 9( {x}^{2} - 9) = 0 \\ {x}^{2} - 9 = 0 \\ {x}^{2} = 0 + 9 \\ {x}^{2} = 9 \\ x = \sqrt{9} \\ x = 3$

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