# How do you subtract #1/ a - 2/ a ^ { 2} - 3/ a ^ { 2} #?

##### 1 Answer

Nov 28, 2016

#### Explanation:

2 of the fractions have a denominator of

#a^2.# Before subtracting the 3 fractions we require them all at have a denominator of#a^2# This can be achieved by multiplying

#1/a" by " 1 " in the form " a/a#

#rArr1/axxa/a=a/a^2#

#rArra/a^2-2/a^2-3/a^2=(a-2-3)/a^2=(a-5)/a^2#