They are: 36+9 = 45
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GM of two numbers is the square root of their product, in this case sqrt 2025 ie 45.
To find two numbers that add up to 45 and multiply to -196, we can set up a system of equations. Let's call the two numbers x and y. We have the equations x + y = 45 and x * y = -196. By solving these equations simultaneously, we can find that the two numbers are 13 and -15, as 13 + (-15) = 45 and 13 * (-15) = -196.
Just use the definition of geometric mean. Multiply all the numbers together, then take the square root. (In this case, it is the square, or second, root, because there are two numbers; for the geometric mean of three numbers, you take the cubic root, etc.)
4545 * 2 = 90You can do this in your mind by adding 40 + 40 = 80, then add the two fives 5 + 5 = 10, and add those two sums together. 80 + 10 = 90.
6.708203932499369 x 6.708203932499369 = 45