factories 16x²- 81y²
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Answer:
GIVEN EXPRESSION is = 16x^2-81y^2
16x^2 = (4x^2)
81y^2 = (9y)^2
It has two perfect square terms. So pattern of difference of square is used
16x^2 - 81y^2=(4x+9y)(4x-9y)
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