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

My answer

a^2 - 9 = 0

(a - 3)a + 3)

2. 4a^2 - 4a+1

My Answer

4a^2 - 4a + 1

= 4a^2 - 2a - 2a + 1

= 2a(2a - 1) - 1(2a - 1)

= (2a - 1)(2a - 1)

3. 72 - 22x + x^2

My answer

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

My Answer

3x^2+5x-2=0

=3x^2+6x-x-2

=3x(x-2)-(x+2)

=(3x-1)(x+2)

Oh, the x^2 is squared.

Thanks in advance.

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