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Anonymous
To factor a perfect square, it should be in the form a2+2ab+b2
For example: 9x2+18xy+9y2
First factor out the 9: 9(x2+2xy+y2)
Make a2+2ab+b2 into (a+b)2 : 9(x+y)2
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We need to know what number the square is a factor of.
1 and 4.
1 and 25
9
81