Tuesday

October 21, 2014

October 21, 2014

Posted by **Anonymous** on Wednesday, September 23, 2009 at 10:38pm.

My solution: y over x

Am I right?

- Algebra -
**Reiny**, Wednesday, September 23, 2009 at 11:00pmyes

again, what about restrictions?

- Algebra -
**Anonymous**, Wednesday, September 23, 2009 at 11:13pmI'm fairly sure that's the extent to which I need to answer these problems.. I'm not looking for x, therefore restrictions are irrelevant

- Algebra -
**Reiny**, Wednesday, September 23, 2009 at 11:34pmyes they are relevant

by using the = sign we are saying

"what I write next will be exactly equal to what I had before"

e.g.

(x^2 - 4)/(x-2)

= (x+2)(x-2)/(x-2)

= x+2

for every value of x my last expression x+2 is equal to (x^2 - 4)/(x-2)**except when x=2**

when x = 2, our first line is 0/0

but our last line is 4

so is 0/0 = 4 ????

that is why whenever we 'cancel' a variable expression we have to restrict those values that make the divided expression equal to zero.

that is ....

(x^2 - 4)/(x-2)

= (x+2)(x-2)/(x-2)

= x+2 , x not equal to 2

**Answer this Question**

**Related Questions**

Basic Math - Can somebody see if I did these right? 16 divided by (-2)(-4) over ...

Basic Math - Can somebody see if I did these right? 16 divided by (-2)(-4) over ...

Algebra - m+3 over 3m, divided by 6m over m+3 Would the solution be 1 over 18m? ...

algebra 1 help - 6(-3-2)^2 over -3^2-2(-3)(2)+2^2 6(-3-2)^2 over -3^2-2(-3)(2)+2...

Algebra - x^2-25 over x^2+7x, divided by x^2+7x+10 over x^2+9x+14. I found the ...

Algebra 2 - would some one please check these for me 1. divide x^2-36y^2 over 5x...

algebra - x over y minus y over x divided by 1 over y plus 1 over x.

ALGEBRA - If I am dividing the following: x^2+3x over x^2+2x-3 by x over x+1.. i...

ALGEBRA - to solve the following: 4-s over 7-s = 3 over s-7... LCD is s-7 then (...

Algebra - Evaluate the express. nCr (9 over 6)(6 over 4)(3 over 1) n 9 6 3 r 6 4...