For what values of x is the following expression undefined?

(3x – 2)(5x – 4) / (9x – 6)(7x – 1)

Show how you obtained your answer. Why is the answer important?

Question

For what values of x is the following expression undefined?

(3x – 2)(5x – 4) / (9x – 6)(7x – 1)

Show how you obtained your answer. Why is the answer important?

amistre64 · Answer

when the underside goes zero it is undefined

amistre64 · Answer

a*b = 0 when a=0 or b=0, or both = 0

anonymous · Answer

I have  this as my steps
  
1. (3x-2) (5x-4) 
-----------------
(9x-6) (7x-1)

2. Factor out 3 from each term in polynomial.
          (3x-2) (5x-4)
     -----------------------------
       (3(3x)+3(-2))(7x-1)

3. Factor out the 3 from 9x-6
(3x-2)(5x-4)
-------------------------
(3(3x-2))(7x-1)

4. 3(3x-2) (7x-1)=0 This would make the fraction undefined.

amistre64 · Answer

good, but what values of x make it go undefined?

anonymous · Answer

and then

6.Solve the equation to find where the original expression is undefined
X=2/3,1/7

7.The answer is important because if the denominator is equaled to zero, the expression cannot be solved. 


I cant figure out number 5

amistre64 · Answer

it looks good, but what is 5 asking for?

anonymous · Answer

like step i had it all right just my teacher wants me to go back and make the step's clear and i dont know what to put

amistre64 · Answer

i dont know what your teacher would want either.  to be clearer might mean to define your actions by stated axioms and thrms

anonymous · Answer

1. (3x-2) (5x-4)
-----------------
(9x-6) (7x-1)


2. Factor out 3 from each term in polynomial.
          (3x-2) (5x-4)

     -----------------------------
       (3(3x)+3(-2))(7x-1)


3. Factor out the 3 from 9x-6

(3x-2)(5x-4)
-------------------------

(3(3x-2))(7x-1)


4. Then remove the parentheses around the 3.

3(3x-2) (7x-1)=0 This would make the fraction undefined.


5.Solve the equation to find where the original expression is undefined

X=2/3,1/7


6.The answer is important because if the denominator is equaled to zero, the expression cannot be solved.


She says

please show a little more detail in how you got from step 4 to step 5?..

I cant think of any other way

amistre64 · Answer

i got it

amistre64 · Answer

split step 4 into its component parts and solve each part for 0

amistre64 · Answer

(3x-2) (7x-1)=0 ; since a*b = 0 when ....

3x-2=0

7x-1=0

anonymous · Answer

okay so put that where step number 4 is?

amistre64 · Answer

include that into step 4, its transitioning from 4 to 5

amistre64 · Answer

its the part that was done in your head that they wants on paper

anonymous · Answer

ur the best
lol

amistre64 · Answer

;)