Simplify complex fraction This is a really low level question. I'm trying to simplify f (

vittorecostao1

vittorecostao1

Answered question

2022-06-20

Simplify complex fraction
This is a really low level question. I'm trying to simplify
f ( x ) = 36 x 2 3 x 1 18 12 x 2 25 x 1 + 12
After factoring, removing negative exponents, and flipping the second fraction I get
f ( x ) = 1 3 ( 3 x + 2 ) ( 4 x 3 ) ( 3 x 4 ) ( 4 x 3 ) 1
Then ( 4 x 3 ) cancels leaving
f ( x ) = 3 x 4 3 ( 3 x + 2 )
as my final answer. However the book I have says the correct answer is
f ( x ) = 3 ( 2 x + 3 ) 4 x 3
I've checked my work many times and I don't know how they get this answer. Could someone please help me solve this?

Answer & Explanation

crociandomh

crociandomh

Beginner2022-06-21Added 19 answers

I suggest getting rid of the negative exponents first:
36 x 2 3 x 1 18 12 x 2 25 x 1 + 12 = 18 x 2 + 3 x 36 12 x 2 25 x + 12 = 3 ( 3 x 4 ) ( 2 x + 3 ) ( 3 x 4 ) ( 4 x 3 ) = 3 ( 2 x + 3 ) 4 x 3   .
manierato5h

manierato5h

Beginner2022-06-22Added 5 answers

Your error came when you factored 36 x 2 3 x 1 18 as ( 36 x 2 3 x 1 18 ) 1 which is not the same as 36 x 2 3 x 1 18, the correct way to solve comes when you realize that 36 x 2 is the same as 36 / x 2 , seeing as this is the case you multiply the fraction by x 2 and get − 18 x 2 + 3 x 36 / 12 x 2 25 x + 12 and David's solution takes it from there.

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