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January 31, 2015

January 31, 2015

Posted by **Tamir** on Thursday, May 20, 2010 at 8:01pm.

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.

- Algebra 1 -
**Jen**, Thursday, May 20, 2010 at 9:02pm1. correct

2. correct

3. correct but could go from 2nd line to last

4. correct

You know you can check these by foiling, right? (when you multiply out your answers and then see if you got what you started with)

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