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 (x3)^2.
So the perimeter is 4(x3) = 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(x3)^2?

Algebra  Jazzie, Saturday, June 12, 2010 at 11:44am
Why? x3 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. 4x12 is correct
33. You probably meant to type
k^2 + kf  2f^2 which is
=(k+2f)(kf)
38.
Amount = 2000(1.02)^32
= .....