# Thread: Basic Algebra Question

1. ## Basic Algebra Question

I have a book that teaches the foundations of algebra. I've become stuck on a question: 3a^2 + 2ab + b, when a = 2 and b = 3. The book says the answer is 27. How is that figure derived?

Thanks!

2. ## Re: Basic Algebra Question

As an example, I will vary it a little
$\displaystyle 3a^3 + 4ab + 2b$, when $\displaystyle a = 5$ and $\displaystyle b = 7$
All you do is plug the numbers given into the problem and solve.
$\displaystyle 3a^3+4ab+2b$
$\displaystyle 3(5)^3+4(5)(7)+2(7)$
You just solve it from there.
$\displaystyle =529$
Try it on your own problem.

3. ## Re: Basic Algebra Question

Hello, MathClown1

I have a book that teaches the foundations of algebra.
I've become stuck on a question: .$\displaystyle 3a^2 + 2ab + b$, when $\displaystyle a = 2$ and $\displaystyle b = 3.$

The book says the answer is 27.
How is that figure derived?

It would helpful if you showed your work.

Then we can see how you got your answer (other than 27).
And we can point out your error

4. ## Re: Basic Algebra Question

Solved it, thanks! It was done this way: (3x2x2)+(2x2x3)+(3) = 27

5. ## Re: Basic Algebra Question

Did you get what I said? You just plug the given values into the equation where the given variable is. Rather simple no?