Question

Verify that a+(b+c) = (a+b+) +c by taking a = -4/5 , b = 7/5 ,c = 3/4

Answer 1

a + (b+ c) = -4/5 + (7/5 + 3/4) = -4/5 + (28 + 15 / 20) = -4/5 + 43/20 = -16+43/20 = 27/20
(a+ b) + c = (-4/5 + 7/5) + 3/4 = 3/5 + 3/4 = 12 + 15/20 = 27/20
∴a + (b + c) = (a + b) + c
hence verified