Posted by mchawk on .
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,
not quite,
You left out the constant term after you expanded
A(x) = (2x1)(x+2)
it should have been 2x^2 + 3x  2
adjust A(5) accordingly