Question

Check my work?

Answer 1

expand and simplify the binomial product.
(x + 10)^2

i used the FOIL method and got
x^2 + 10x + 10x + 100

and then i combined like terms and got
x^2 + 20x^2 + 100

what did i do wrong?

Answer 2

Your application of the FOIL method was done just fine.
However, 10x + 10x is 20x, whereas you seem to have multiplied x by itself. Don't.
Start with the result of your application of the FOIL method and add those two middle terms. This will give you the correct answer.

Answer 3

so the answer is just
x^2 + 20x^2 ?
i'm confused

Answer 4

Let me turn around and ask you a question: How did you get 20x^2, and how would you justify that result?

Answer 5

i added 10x+10x

Answer 6

Sammy: what would you get if you added $10 to $10?

Answer 7

20.. right?

Answer 8

$20.

Answer 9

Right

Answer 10

ohhh wait so is it

x^2+20x+100 ?

Answer 11

$20. Right. I notice that you did not respond as 20*(dollars)^2.
Try again: add: 10x + 10x = ?

Answer 12

Yes, now you've got it! x^2 + 20x + 100 is perfect. Good going!

Answer 13

thank you, my mind was going blank hahaha.

Answer 14

Glad you've been able to solve this problem! Best to you. Over and out.