Answer :
In given expression
Both terms are perfect square
⇒ 64x2 = 8x × 8x
⇒ 81 = 9 × 9
∴ 81-64x2 Seems to be in identity a2-b2 = (a + b)(a-b)
Where a = 9 and b = 8x;
81-64x2 = (9-8x)(9 + 8x)
Hence the factors of 81-64x2are(9-8x) and (9 + 8x)
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