Math
posted by Kristen on .
The area if a rectrangular swimming pool can be represented by the trinomial expression 6xsqaured+5x4. If x= 4m, what is the total area of the pool and what are it's dimensions?

Wherever there's an x, put in 4m and solve. 6(4m)^2+5(4m)4=

Oh Thank you,
But them what are the dimensions?
How do i figure out that? 
Our area of
6x^2 + 5x  4 factors to
(3x+4)(2x1)
so if x = 4
3x+4 = 16
2x1 = 7
So the length is 16 and the width is 7
Note that 7(16) = 112 which is what you get if you follow Jen's substitution.