Algebra Please Check answers
posted by Rae Rae .
Directions: Determine whether each trinomial is a perfect square. If so, factor it.
2. 4a^2+4a+1
Answer: 2(a+1)^2
3. 9m^2+15m+25
Answer: no
4. d^222d+121
Answer: (d11)^2
Directions: Determine whether each binomial is the difference of squares. If so, factor it.
5. x^216
Answer: (x4)(x+4)
6. y^220
Answer: no
7. 16m^225n^2
Answer: (m+4)(5+n)
8. 8a^218
Answer: (7+ab)(7ab)

#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^225n^2 ????
should have been (4m+5n)(4m5n)
in #8, first take out a "common factor" of 2, then you should see the difference of squares
8a^218
= 2(4a^2  9) = 2(2a+3)(2a3)
again, how could your answer of
(7+ab)(7ab) possibly turn into 8a^2  18 ??? And where did the b come from ???