Asked by mchawk

Find a trinomial A(x) that represents the area of a parallelogram whose base is 3x + 2 meters and whose height is 2x + 3 meters. Find A(3).

This is what I got:
(3x+2)(2x+3)=
6x^2+9x+4x+6=
6x^2+13x+6 Is this right?

Answered by Reiny
your statement should have been preceded by A(x) like this
A(x) = (3x+2)(2x+3)

then A(3) = (11)(9) = 99

It really doesn't matter whether you expand your expression or leave it in factored form.
In this case I was able to do the arithmetic mentally, had I used the expanded form I would have had to remember 4 different numbers then add them.
Answered by mchawk
Reiny,

So since it is asking for A(x) and the x is what I wrote in parenthese I can leave it as A(x)= (3x+2)(2x+3).

If I wanted to solve, how did you get the (11)(9)? Wouldn't you do the FOIL method which would be:

6x^2+4x+9x+4=
6x^2+13x+4

I gues I got lost somewhere.
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