1,4,9,25,36,49,64,81,100,121,144,169,196,225
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The first 15 square numbers are 1, 4, 9, 25, 36, 49, 64, 81, 100, 121, 144, 169, 196, 225.
3.14159265358979
Hhjb
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.)
A is a perfect square trinomial, so first you factor it:A = (x-15)(x-15)This is a square with one side being (x-15).So the perimeter must be (x-15)+(x-15)+(x-15)+(x-15) because a square has four sides.So P = 4x-60