# Really basic expanding question: Forgot how!

## Homework Statement

Going through my review material, and I need some help on this simple procedure.

example 1: (2x + 1)^2

example 2: 2(x^2 -1)

## The Attempt at a Solution

Example 1: 2x squared is 4x?.... I dunno. Im stuck. I need a good review on how to do this simple procedure. Any website link to a review/refreasher would be good.

Thanks guys

Related Precalculus Mathematics Homework Help News on Phys.org
Mark44
Mentor

## Homework Statement

Going through my review material, and I need some help on this simple procedure.

example 1: (2x + 1)^2

example 2: 2(x^2 -1)

## The Attempt at a Solution

Example 1: 2x squared is 4x?.... I dunno. Im stuck. I need a good review on how to do this simple procedure. Any website link to a review/refreasher would be good.

Thanks guys
Ex. 1: What does the exponent 2 indicate?
Ex. 2: Hint - distributive property.

Don't you have a textbook?

Just have a calculus book. I am doing a review for calc, and I dont have a Math 12 book.

Ex 1: would it turn into (2x + 1)(2x + 1) ?

Ex 2: would it be just (2x^2 - 2)????

Ex. 1: What does the exponent 2 indicate?
Ex. 2: Hint - distributive property.

Don't you have a textbook?

Last edited:
Mark44
Mentor
1. Yes, but you still need to expand it. There are four multiplications - FOIL (first, outer, inner, last)
2. Yes.

Just have a calculus book. I am doing a review for calc, and I dont have a Math 12 book.

Ex 1: would it turn into (2x + 1)(2x + 1) ?
Remember that for #1, each pair of factors needs to be grouped together for multiplication (ie 2x*2x, 2x*1, 1*2x, 1*1). After you're done multiplying, add the like terms: 4x2 (remains the same; no like terms to which it can add), 2x+2x=4x, and 1. Final answer: 4x2+4x+1

Mark44
Mentor
Just have a calculus book. I am doing a review for calc, and I dont have a Math 12 book.

Ex 1: would it turn into (2x + 1)(2x + 1) ?

Ex 2: would it be just (2x^2 - 2)????
You're going to have a very tough time in calculus if you are puzzled about basic algebra concepts. If you can't get the book you studied algebra from, there are lots of decent books out there that you could buy for not much money.