Posted by **mysterychicken** on Saturday, June 12, 2010 at 11:29am.

Need help with these---

30. Suppose the area of a square is x^2 - 6x + 9. What is the perimeter of the square?

33. Factor the expression: k^2 + k^f - 2f^2

38. Find the final amount of an investment if $2,000 is invested at an interest rate of 8% compounded quarterly for eight years.

Thanks

-MC

- Algebra -
**Jazzie**, Saturday, June 12, 2010 at 11:36am
30. If we factorise x^2 - 6x + 9, we get (x-3)^2.

So the perimeter is 4(x-3) = 4x -12

I'll need to figure out the others yet in a minute.

- Algebra -
**Jen**, Saturday, June 12, 2010 at 11:37am
Wouldn't the perimeter be 4(x-3)^2?

- Algebra -
**Jazzie**, Saturday, June 12, 2010 at 11:44am
Why? x-3 is the length of ONE side. To calculate

the perimeter of a square, the 4 identical sides are added. But maybe I'm wrong, I dunno....why do you want to square it?

- Algebra -
**mysterychicken**, Saturday, June 12, 2010 at 12:11pm
Jazzie, you're correct. Thanks

-MC

- Algebra -
**Reiny**, Saturday, June 12, 2010 at 5:26pm
30. 4x-12 is correct

33. You probably meant to type

k^2 + kf - 2f^2 which is

=(k+2f)(k-f)

38.

Amount = 2000(1.02)^32

= .....

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