Question

$x^{2}$ — 81 = 0, the value of x is:

Answer 1

Answer:

9 OS the correct answer

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Answer 2

Answer:

9,-9

Step-by-step explanation:

${x}^{2} - {9}^{2}$

$81 = {9}^{2}$

As you know.

${a}^{2} - {b}^{2} = (a + b)(a - b)$

(x+9)(x-9)

x+9=0

x=-9

and second value

x=9