Homework Help: Math

Posted by Kristen on Monday, June 14, 2010 at 9:52pm.

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

Math - Jen, Monday, June 14, 2010 at 10:03pm
Wherever there's an x, put in 4m and solve. 6(4m)^2+5(4m)-4=
Math - Kristen, Monday, June 14, 2010 at 10:09pm
Oh Thank you,
But them what are the dimensions?
How do i figure out that?
Math - Reiny, Tuesday, June 15, 2010 at 12:37am
Our area of
6x^2 + 5x - 4 factors to
(3x+4)(2x-1)

so if x = 4

3x+4 = 16
2x-1 = 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.

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