Find the product of (2x+3y)(4x-9y)
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(2x – 3y)(2x + 3y) (4x2 + 9y2)
Identity (a + b)(a-b) = a2 -b2
= [(2x)2 – (3y)2](4x2+ 9y2)
= (4x2 – 9y2)(4x2 + 9y2)
= (4x2)2 – (9y2)2
= 16x4 – 81y4
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gewgf
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