Posted by Tamir on Thursday, May 20, 2010 at 8:01pm.
Hello. Can someone check my answers to the following
Factor each of the following
1. a^2 - 9
a^2 - 9 = 0
(a - 3)a + 3)
2. 4a^2 - 4a+1
4a^2 - 4a + 1
= 4a^2 - 2a - 2a + 1
= 2a(2a - 1) - 1(2a - 1)
= (2a - 1)(2a - 1)
3. 72 - 22x + x^2
72 - 22x + x^2
= x^2 - 22x + 72
= x^2 - 18x - 4x + 72
= x (x - 18) - 4 (x - 18)
= (x - 4) (x - 18)
4. Solve by factoring 3x^2 + 5x - 2 =0
Oh, the x^2 is squared.
Thanks in advance.
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