10. If a = -8. b = -7. c = 6. verify that (a + b)+c= a +b+ch
11. If a = -9 and b = -6. show that (a - b) =(b-a).
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Step-by-step explanation:
10. a = -8 , b = -7 , c = 6
(a+b)+c = (-8-7)+6 a+b+c = -8-7+6
= -15+6 = -15+6
= -9 = -9
ie, (a+b)+c = a+b+c
11. a = -9 , b = -6
a-b = -9--6 b-a = -6 --9
= -9+6 = -6+9
= -3 = 3
ie, a-b = -(b-a)
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