3 x 10^11 - 3 x 10^12

To calculate the value of the expression 3 x 10^11 - 3 x 10^12, we can first simplify it by factoring out a common factor of 3 x 10^11 from both terms:

3 x 10^11 - 3 x 10^12 = (3 x 10^11) x (1 - 10)

Next, we can simplify the expression inside the parentheses:

1 - 10 = -9

Now, we can substitute this value back into the equation:

3 x 10^11 - 3 x 10^12 = (3 x 10^11) x (-9)

Finally, we can calculate the product of (-9) and (3 x 10^11):

(3 x 10^11) x (-9) = -27 x 10^11

Therefore, 3 x 10^11 - 3 x 10^12 simplifies to -27 x 10^11.