9. Factorise the following:
(1) 4x2 + 12xy +9y2
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Answer:
4x2+12xy+9y2
4x2+6xy+6xy+9y2
2x(2x+3y) 3y(2x+3y)
(2x+3y)+(2x+3y)
(2x+3y)2
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