1. ## [SOLVED] I need my answers checked.

The following questions came with only one instruction: simplify.

question #1:(x+2)(x+3)

Question #2: (2x-5)(3x+2)

Question #3: (2x+5)(x^2-x-2)
2x(2^2-x-2)+5(x^2-x-2)

Drakmord

2. Originally Posted by drakmord
The following questions came with only one instruction: simplify.

question #1: (x+2)(x+3)
Wrong.

Question #2: (2x-5)(3x+2)
Wrong.

Question #3: (2x+5)(x^2-x-2)
2x(2^2-x-2)+5(x^2-x-2)
A good start but not finished.

Drakmord
How about showing HOW you got those answers so we can make suggestions to correct them.

3. Here's a good place to learn how to do these: Simple Polynomial Multiplication

4. Originally Posted by drakmord
The following questions came with only one instruction: simplify.

question #1: (x+2)(x+3)

Question #2: (2x-5)(3x+2)

Question #3: (2x+5)(x^2-x-2)
2x(x^2-x-2)+5(x^2-x-2) ====> I corrected your type here.

Drakmord
Hi drakmord,

Do #1 and #2 the same way as you started doing #3, but complete the job as Hallsofivy suggested. You need to complete the distribution and combine like terms.

Also, the site that Stroodle gave you is a good one. It appears that in #1 and #2 you are having a little trouble deciding if you should be multiplying or adding. Did you state them correctly? If you did, then you should be multiplying.

5. Hi there,

I believe your working should look something like this:

(x+2)(x+3)= x(x+3) + 2(x+3) = x^2 + 3x + 2x + 6 = x^2 + 5x + 6

(2x-5)(3x+2) = 2x(3x+2) -5(3x +2) = 6x^2 + 4x -15x -10 = 6x^2 -11x -10

(2x+5)(x^2-x-2) = 2x(x^2-x-2)+5(x^2-x-2)= 2x^3-2x^2-4x+5x^2-5x-10 = 2x^3+3x^2-9x-10

Cheers

6. Thank you so much for the assist guys!

Originally Posted by Joel
Hi there,

I believe your working should look something like this:

(x+2)(x+3)= x(x+3) + 2(x+3) = x^2 + 3x + 2x + 6 = x^2 + 5x + 6

(2x-5)(3x+2) = 2x(3x+2) -5(3x +2) = 6x^2 + 4x -15x -10 = 6x^2 -11x -10

(2x+5)(x^2-x-2) = 2x(x^2-x-2)+5(x^2-x-2)= 2x^3-2x^2-4x+5x^2-5x-10 = 2x^3+3x^2-9x-10

Cheers
Thanks for that I can see where I went wrong, I used FOIL but did not finish the job.

drakmord