Answer :
In given expression
Both terms are perfect square
⇒ x2 = x × x
⇒ 81 = 9 × 9
∴ x2 – 81 Seems to be in identity a2-b2 = (a + b)(a-b)
Where a = x and b = 9;
x2 – 81 = (x-9)(x + 9)
Hence the factors of x2 – 81 are (x-9) and (x-9)
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