Question

Verify that ( x + y ) + z = x + ( y + z ) if :
a ) x= 9 , y = -2 and z ,=- 20
( urgent )​

Answer 1

Step-by-step explanation:

LHS

(9+(-2))+(-20)=-13

RHS

9+(-2-20)=-13

LHS=RHS

Hence verified

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Answer 2

(X+y)+z= X+(y+z)

(9+-2)+-20= 9+(-2+-20)

7-20= 9-22

-13= -13

l.h.s= RHS.

proved