Question

subtracting rational expressions
(x^2-9x+18) (x-3)
-
(3x+9) (6x^2-54)

Answer 1

@whpalmer4 @thomaster @mathmale

Answer 2

@amistre64 @experimentX @beccaboo333

Answer 3

Sorry I'm not very good with this :c

Answer 4

can you simplify that expression?

Answer 5

yes (x-3)(x-6) for the top left equation and for the bottom its 3(x+3) and 6(x^2-9)

Answer 6

@experimentX

Answer 7

@apoorvk

Answer 8

You have 4 polynomial expressions, say - A,B,C,D (for sake of ease and not having to type the whole thing :P) in the form:

(A X B) - (C X D)

Multiply A and B first, and then C and D (the way you multiply a binomial by a trinomial) - you will get two new terms.
Subtract the two (accordingly), and you will have this problem solved!

Answer 9

is x^2-9x+18 A and (x-3) B?

Answer 10

Yep!

Answer 11

woops!! i forgot to post on this
http://www.wolframalpha.com/input/?i=Simplify%5B%28x%5E2-9x%2B18%29%28x-3%29+-+%283x%2B9%29%286x%5E2-54%29%5D

Answer 12

ok so x^3-12x^2+45x-54 - 18x^3+54x^2-162x-486?

Answer 13

i dont have any answer choices close to that @experimentX

Answer 14

Yes, great!
Just put brackets around the terms to eliminate confusion - because their is a MINUS sign before the entire second term.
x^3-12x^2+45x-54 - (18x^3+54x^2-162x-486)

Answer 15

my answer choices are A.(x^2-9x+18)/2 B.2x^2- 9x + 18 C.x^2-9x+18/x^2+6x+9 D.2x^2 - 18x + 36

Answer 16

@apoorvk

Answer 17

@1645323 I'm still not convinced you have the original problem correctly posted. Is there any way you can either draw the problem, or post a screen shot or something?