Algebra
posted by mysterychicken on .
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

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. 
Wouldn't the perimeter be 4(x3)^2?

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? 
Jazzie, you're correct. Thanks
MC 
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
= .....