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D( x )
x < 0
1.2*x^3.7 = 0
x < 0
1.2*x^3.7 = 0
1.2*x^3.7 = 0
1.2*x^3.7 = 0 // : 1.2
x^3.7 = 0
x = 0
x in (0:+oo)
y/(1.2*x^3.7)-4.5 = 19.52 // - 19.52
y/(1.2*x^3.7)-19.52-4.5 = 0
0.83333333*x^-3.7*y = 24.02 // : 0.83333333*y
x^-3.7 = 28.82400012*y^-1
-3.7 < 0
1/(x^3.7) = 28.82400012*y^-1 // * x^3.7
1 = 28.82400012*x^3.7*y^-1 // : 28.82400012*y^-1
0.03469331*y = x^3.7
x^3 = (0.03469331*y)^(1/0.7) // ^ 1/3
x = 0.03469331^0.4761904719047619*y^0.4761904719047619
x = 0.03469331^0.4761904719047619*y^0.4761904719047619
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