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Factor 4x4 - y2
That is the difference of two perfect squares. Write
4x4 as (2x2)2
(2x2)2 - y2
Then use factoring formula:
A2 - B2 factors as [A - B][A + B]
In your problem:
(2x2)2 - y2
A = 2x2 and B = y, so
A2 - B2 = (2x2)2 - y2 =
[A + B][A - B] = [(2x2) - y][(2x2) + y] =
[2x2 - y][2x2 + y] =
(2x2 - y)(2x2 + y)
Edwin
AnlytcPhil@aol.com
