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posted by Jim on Tuesday, April 2, 2013 at 10:23am.
1) (x+3)^2 - (x+1)^2 2) (x-4)^2 - 16(x+2)^2
a^2-b^2 = (a-b)(a+b) so (x+3)^2 - (x+1)^2 = ((x+3)-(x+1))((x+3)+(x+1)) = (2)(2x+4) = 4x+8 similarly for the other
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