factorise (2x+3y)^2-9z^2
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Answer:
(2x+3y)²-(3z)²
(2x+3y-3z)(2x+3y+3z)
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use formula (a^2-b^2)=(a+b)(a-b)
so,(2x+3y+9z)(2x+3y-9z)
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