Homework Help: Algebra

Posted by mchawk on Monday, October 27, 2008 at 9:18am.

Swimming space. The length of a rectangular swimming
pool is 2x - 1 meters, and the width is x + 2 meters. Write
a polynomial A(x) that represents the area. Find A(5).

I have the polynomial being:
A(x)=2x^2+3x

If I find A(5):
2*5^2+3*5
2*25+15
65 meters.

Is this right?

Algebra - Reiny, Monday, October 27, 2008 at 9:41am
not quite,
You left out the constant term after you expanded
A(x) = (2x-1)(x+2)

it should have been 2x^2 + 3x - 2

adjust A(5) accordingly

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