sqrt(x) / x = 1 / sqrt(x)
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4
2x3 - 2x2 - x + 1 = 2x2(x -1) - (x - 1) = (x - 1)(2x2 -1) = (x - 1){[(sq. root of 2)(x)]2 -12} = (x - 1)[(sq. root of 2)(x) - 1][(sq. root of 2)(x) + 1]
0.3636
0.8
36 (sq rt 81 x sq rt 16 = 9 x 4 = 36)