I understand this expression to be 10x3 + 5x.
Derivative: 30x2 + 5.
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The idea is to use the chain rule. Look up the derivative of sec x, and just replace "x" with "5x". Then multiply that with the derivative of 5x.
2.5x2 + any constant
9
f(x) = 3x2 + 5x + 2fprime(x) = 6x + 5
y = 5xy' = 5xln5 = ln5(5x)y" = ln5(5xln5) = (ln5)25x = 2.59(5x)