3.89: Recover f(x)f(x) from f(x)f''(x) and given values

0606/12/F/M/23 — Question 6 · 8 marks

Given that f(x)=(5x+2)25f''(x) = (5x + 2)^{-\frac{2}{5}}, f(6)=173f'(6) = \dfrac{17}{3} and f(6)=263f(6) = \dfrac{26}{3}, find an expression for f(x)f(x).
[8]