(x^12-x^9)(x^3-10)

Question

(x^12-x^9)(x^3-10)

icalibear · Answer

ok well first, combine like terms.

anonymous · Answer

i got the final answer to bex^15-11x^12+x^9
is that right?

anonymous · Answer

x^15-11x^12+x^9

ash2326 · Answer

Check again, there is a small mistake:)

anonymous · Answer

x^10 instead of x^9??

hero · Answer

(x^12-x^9)(x^3-10)
=x^3(x^12-x^9)-10(x^12-x^9)
=x^15-x^12-10x^12-10x^9
=x^15-11x^12-10x^9

hero · Answer

It was a good effort chloe

ash2326 · Answer

@chloeking42 did you understand?

hero · Answer

She understands, she just made a small mistake

hero · Answer

A couple of small mistakes, but who's counting?

anonymous · Answer

it was plus 10x^9 not minus.

hero · Answer

This is exactly why you should learn these. So you can check your own answers

anonymous · Answer

-.- im trying but seriously i cant fail this quiz

hero · Answer

Did they give you half credit for that question or did they say it was completely wrong?

anonymous · Answer

completely wrong

anonymous · Answer

ok so for this one
(4-x^2)(x-x^3)
i got this
x^5-4x^3+5x?

hero · Answer

I'm sorry to hear that. In that case, you have to do whatever it takes to pass. I recommend using wolfram alpha. http://www.wolframalpha.com/

hero · Answer

That's the only way to make sure your answers are correct.

hero · Answer

You can still try doing them on your own and using wolfram alpha to check them.

anonymous · Answer

why has no one told me of this site before D;

hero · Answer

I just thought of it because of how even if you get a sign wrong, the whole thing is marked wrong.

hero · Answer

You need to have a way to check your answers. Initially the focus was trying to ensure you at least were familiar with the method for multiplying binomials.