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(3x10^3) x (2.5x10^4) = 3000 x 25000 = 75000000
sqrt(x2) = x Though we generally only write the positive solution, in some cases it is helpful to remember that the full answer is "plus or minus x".
There is only one solution: x = 15. Consequently the remainder of the question is nonsense.
What is the number of integral solution to x plus y plus z equals 100?
You cannot since it has no solution.