# Algebra

posted by 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

• Algebra - ,

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 - ,

Wouldn't the perimeter be 4(x-3)^2?

• Algebra - ,

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 - ,

Jazzie, you're correct. Thanks
-MC

• Algebra - ,

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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