- Thread starter tmelucero
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I'm actually helping a friend who took a test and the given information was as follows

a^2+n+2b^2

and the factor of it is

(a+b)(a+2b)

so N=2ab right?

but it was a test and there were multiple choice answers and the answers were all fractions

Let's see if I've got this right. You were given this expression:tmelucero said:I'm actually helping a friend who took a test and the given information was as follows

a^2+n+2b^2

and the factor of it is

(a+b)(a+2b)

so N=2ab right?

but it was a test and there were multiple choice answers and the answers were all fractions

a[sup:2tj27kjm]2[/sup:2tj27kjm] + n + 2b[sup:2tj27kjm]2[/sup:2tj27kjm]

You are told that the factors of this expression are (a + b) and (a + 2b).

If that's all correct, then you could multiply out (a + b)(a + 2b) to get

a[sup:2tj27kjm]2[/sup:2tj27kjm] + 2ab + ab + 2b[sup:2tj27kjm]2[/sup:2tj27kjm]

or,

a[sup:2tj27kjm]2[/sup:2tj27kjm] + 3ab + 2b[sup:2tj27kjm]2[/sup:2tj27kjm]

Comparing this with the original given trinomial, it sure looks to me like n = 3ab.

However, since it took two posts to get the information about the factors, I wonder if there is something ELSE important that we don't know yet.