math help? multiplyilng with exponents...

how do i solve 12x Square + 9x square?
i am pretty sure it's 21x something but i dont know if i'm supposed to add the exponents or keep them a 2.
anybody know this?

 

No dude, you got it right.

 

...so the answer is 21x Square?

 

yep ^^ si, ya, wee, (other word to express agreement)

 

You've got it right, but when you multiply with exponents, you add the exponents.

Here's an example:

21^3 = 21 x 21 x 21

23^2 = 23 x 23

23^2 x 21^3 = 483^5


Hope this helps.

 

ok thanks.
i'm rusty im math they took me out 3 yaers ago and just put me in algebra...
and they gave me psychology 3 times even though i never failed it... my school it ******ed.

 

Multiply coefficients I think? Or add them. Add exponents for sure. 21x to the fourth should be correct. If not, it's a lot bigger due to 12 x 9. But it probably isn't that. lol

 

12x^2 + 9x^2 = (12 + 9)x^2 = 21x^2

 

thats the way i worked it out. i finished my work though.

i was just double checking here, thanks everyone.