factorise: 4x²+15xy+9y²
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Answer:
using identity 1st
a²+2ab+b²
4x²+15xy+y²= (2x)²+12+3xy+9y²
= 2x(2x+3y)+3y(2x+3y)
= (2x+3y)(2x+3y)
= (2x+3y)²
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