9x2-4a2+4ay-y2 please help me to get the answer
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9x2 - 4a2 + 4ay - y2
= 9x2 - (4a2 - 4ay + y2), taking ' - ' common
= (3x)2 - (2a - y) 2 , since A2 - 2AB + B2 = (A - B)2
= [3x - (2a -y)][3x + (2a - y)], using A2 - B2 = (A - B)(A + B)
= (3x - 2a + y)(3x + 2a - y) Ans.
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