Another math Christmas blog

Hi Another blog on Christmas !!:D



see that ? ^.^

today's question is : How do we add and subtract rational expressions?

so lets start lets say you get an expression like :

4b2-12 + b+3
  b +3      b+3

Step 1:
find the common denominator for the non siplified part of the expression.
therefore ;

4b2-12
Greatest number is b and 4 
so :
4b(b-3)

Step two: connect it back to the full expression :

4b(b-3) +  b+3
b+3           b+3

Step three.: you cross out the variables that are identical. 


4b(b-3) +  b+3
b+3           b+3


4b(b-3) +  b+3
b+3           b+3



4b(b-3) + 1  
 b+3

 Step four: combine what is left
4b(b-3)+1
 b+3


Works cited
Picture :http://img.spikedmath.com/comics/124-christmas-puns.png