Question

Verify ×+y(y+z)=(x+y)+z
×=-2/3,y=7/8,z=-3/5

Answer 1

verified

Step-by-step explanation:

Verify x+(y+z)=(x+y)+z for the following values of x,y,z (i)x=3/4,y=5/6,z=-7/8(ii)x=2/3,y=-5/6,z=-7/9(iii)x=3/5,y=-6/9,z=2/10(iv)x=-3/5,y=-7/10,z=-8/15

To Verify x+(y+z)=(x+y)+z

(i)x=3/4,y=5/6,z=-7/8

LHS = 3/4 + (5/6 + (-7/8)) = (3/4) + (5/6 -7/8) = (3/4) + ((20 - 21)/24) = 3/4 - 1/24

= (18 - 1)/24 = 17/24

RHS = (3/4 + 5/6) + (-7/8) = (9 + 10)/12 - 7/8 = 19/12 - 7/8 = (38 - 21)/24 = 17/24

LHS = RHS = 17/24

(ii)x=2/3,y=-5/6,z=-7/9

LHS = 2/3 + (-5/6 + (-7/9) = 2/3 + ( -5/6 - 7/9) = 2/3 + (-29/18) = 2/3 - 29/18

= 12/18 - 29/18 = -17/18

RHS = (2/3 + (-5/6) ) + (-7/9) = (2/3 - 5/6) - 7/9 = (-1/6) - 7/9 = -1/6 - 7/9 = -3/18 - 14/18 = -17/18

LHS = RHS

Hence verified

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Answer 2

Answer:

335/45

Step-by-step explanation:

-2/3+7/8(7/8-3/5)=(-2/3+7/8)-3/5

(7/3)^2+7/3(-2/3-3/5)-2/3*-3/5

49/9+7/3*-1/15+6/15

70/9-5/15

350/45-15/45

335/45