FFactor the trinomial. r^2 - 2rd - 80d^2

Question

FFactor the trinomial.  r^2 - 2rd - 80d^2

saifoo.khan · Answer

Hewweo.

anonymous · Answer

Hey!

saifoo.khan · Answer

$$r-80 d^2 $$

anonymous · Answer

LOL...that is the same answer I came up with, but it says it's not correct.

anonymous · Answer

Um... is somebody plugging the values straight into wolfram?

saifoo.khan · Answer

there's no doubt in that. :P

anonymous · Answer

Yes and the "input" is not coming out right so therefore, it is giving the wrong answer.

anonymous · Answer

haha:
$$(r - d)^2 - 81d^2$$

anonymous · Answer

That's the best I can do..

anonymous · Answer

Let me check...

anonymous · Answer

No, that's not right either.  hmmmm

anonymous · Answer

hey mathsboy how did you come oup with the eq'n in my question

anonymous · Answer

It says to rewrite the trinomial in descending powers of r, if necessary.  First, factor out any common factors then use the FOIL method in reverse.  To do this, factor the first and last terms of the trinomial.  Use numbers that, when added together, result in the middle term of the trinomial.

saifoo.khan · Answer

might be there is some mistake in mathlab.

anonymous · Answer

Yea, could be.  I think I will ask for a replacement question.

anonymous · Answer

Nope, it's most likely the interpretation of the copy/pasted text.

anonymous · Answer

Yea, that may be true too.  It does not seem to be interpreting what I am typing in correctly.

saifoo.khan · Answer

we cannot paste text in mathlab.

anonymous · Answer

When I type it into Wolfram, it is interpreting it as r^2/2 - 80d^2

saifoo.khan · Answer

$$(r-10 d) (r+8 d) $$

saifoo.khan · Answer

Answer^

anonymous · Answer

Correct answer is (r+8d)(r-10d)

saifoo.khan · Answer

I gave it to you! :O

anonymous · Answer

LOL, I know and I got impatient so now I have to do an alternate question.  haha

saifoo.khan · Answer

LOL.

anonymous · Answer

okay, try this one.  s^2 - 8sz - 20z^2

saifoo.khan · Answer

(s-10 z) (s+2 z)

saifoo.khan · Answer

btw, how many hours are left for your assignmnt?

anonymous · Answer

This is due tonight.  The "other" one isn't due until Sunday.

saifoo.khan · Answer

how many hours are left?

saifoo.khan · Answer

the thing is, it's 02:55am here.
I gotta sleep now!!
Bye! :)
i might be back in 6 hours!!

anonymous · Answer

Okay!!!  I totally understand.  I just might still be here.  LOL  Thank you!!

anonymous · Answer

9 hours