You obtain the absolute minimum of the function when x=0. (0^4)-2 =0-2=-2. So, the lower bound of the function is -2.
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sqrt(x4) = x4/2 = x2
24
N = x4 x8 = x4+4 = (x4)2 = N2
x4 + 7x2 - 60 = x4 + 12x2 - 5x2 - 60 = x2(x2 + 12) - 5(x2 +12) = (x2 - 5)(x2 +12)
2% (50 x4) / 100