Posted by Rae Rae on Sunday, April 5, 2009 at 4:32pm.
#2, no
all you had to do is expand your answer to see that it can't be right.
should have been (2a + 1)^2
#7, your answer is not in factored form, it shows a subtraction, not a multiplication.
just look at your answer!
how can (m+4)-(5+n) possible be 16m^2-25n^2 ????
should have been (4m+5n)(4m-5n)
in #8, first take out a "common factor" of 2, then you should see the difference of squares
8a^2-18
= 2(4a^2 - 9) = 2(2a+3)(2a-3)
again, how could your answer of
(7+ab)-(7-ab) possibly turn into 8a^2 - 18 ??? And where did the b come from ???
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