Oh, what a happy little question! 20 squared is simply 400. Just imagine that number as a beautiful, peaceful meadow where numbers play and dance in the sunlight. Keep painting with numbers, my friend, and let your creativity flow!
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20 squared is 400 which is a rational number
5x2 - 20 = 0x2 - 4 = 0x2 = 4x = +2 and -2
the hypotonose of a triangle is the square root or one side squared plus the other side squared.
(x - 5)(x + 4)
If you mean: 3x squared -11x -20 = 0 Then: x = -5 or x = 4/3