Question

If x = 10.0+-0.1 and y= 10.0+-0.1, then 2x-2y is equal to

Answer 1

Given data states the value of x and y and is asking the value of 2x – 2y,

Therefore putting the value of x and y into the equations,

Substituting x = 10.0 + -0.1 and y = 10.0 + -0.1 in  2x-2y = {2[10.0 +(-0.1)] – 2[10.0 + -(0.1)]}

Rearranging them, we get = {2[10.0-10.0] +2[(-0.1)+(-0.1)]} = {2 [0.0] + 2[-0.1-0.1]} ={0.0 + 2 x [-0.2]} =0.0- 0.4  

Hence 2x -2y = -0.4 .

Answer 2

Answer:

-0.4. . . . . . the explanation given by others is absolutely correct