Question

3x2-243=0
$3x {}^{2} - 243 = 0$

Answer 1

$3 {x}^{2} - 243 = 0 \\ \\ 3( {x}^{2} - 81) = 0 \\ \\ {x}^{2} - 81 = 0 \\ \\ {x}^{2} = 81 \\ \\ x = \sqrt{81} \\ \\ x = 9 \\ \\ hope \: it \: will \: help \: you$
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Answer 2

3x²-243 = 0

3(x²-81) = 0

now taking (x²-81) = 0

                    taking them in there squares........

                      (x)² - (9)²= 0

                  as per a²-b²= (a+b)(a-b)

                 so,  (x+9)(x-9)=0

                         (x+9)=0  ,    (x-9)=0

                            x = -9    ,     x = 9

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