Inactive Tutor answered • 10/08/14
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4c2 - a2 - 6ab - 9b2 = 4c2 - (a2 + 6ab + 9b2) = 4c2 - (a + 3b)2
= [2c - (a + 3b)][2c + (a + 3b)] = (2c - a - 3b)(2c + a + 3b)
Bob C.
asked • 10/08/144c^2-a^2-6ab-9b^2
factoring by grouping
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