If a=3/10; b=-3/7

Question

show that a-b is not equal to b-a?

Answer 1

Fractions with different denominators can not be added. So, write the equation with common denominator.

Find the least common denominator L.C.M.

Multiples of 10 = 10, 20, 30, 40, 50, 60, 70, 80

Multiples of 7 = 7, 14, 21, 28, 35, 42, 49, 56, 63, 70, 77

Least Common Multiple of 10 and 7 is 70

Write the right hand side equation with common denominator.

Since denominators are same add the numerators over the denominator