Question

HELP?
The area of a poster board is x2 + 3x - 10 inches. The width is x - 2 inches.
Find the dimensions of the poster board when x = 14.

Answer 1

The area is 228. Use it to find the dimensions.

Answer 2

How would I do that? Sorry I haven't learned this.

Answer 3

First we want to factor \(x^2+3x-10\), to find the length.
We already know that one of them is, so to find the length we find what number 2x=-10, and added together=3, in this case it is -5.
So factored it is \((x+5)(x-2)\)
so now we know the Length is x+5 and the width is x-2
We plug in 14, \((14+5)x(14-2)\)