Question

PLease Help
Easy Question!!!

Answer 1

\[\frac{ 21 }{ (12-x) }-\frac{ 21 }{ 12+x }\]
How o solve these?

Answer 2

Find a common denominator.

Answer 3

\[\large\frac{a}{b}+\frac{c}{d}=\frac{ad+bc}{bd}\]

Answer 4

find the common denom and this is what it will be
also (a-b)*(a+b)=(a^2-b^2)