aku kurangnya di MM, bantu jawab ya,

[tex]f(x) = 20 x^{3 \frac{1}{2} } + 2 x^{2 \frac{1}{2} } +10x \\ f'(x)= \frac{7}{2} .20 x^{3 \frac{1}{2}-1 } + \frac{5}{2}.2 x^{2 \frac{1}{2}-1 } +1.10 \\ f'(x)=70 x^{ \frac{5}{2} } + 5 x^{ \frac{3}{2} } +10 \\ f''(x)= \frac{5}{2} .70 x^{ \frac{5}{2}-1 }+ \frac{3}{2}.5 x^{ \frac{3}{2} -1} \\ f''(x)= 175 x^{ \frac{3}{2} }+ \frac{15}{2}. x^{ \frac{1}{2} } \\ f''(4)=175(4)^{ \frac{3}{2} } + \frac{15}{2}(4)^{ \frac{1}{2} } \\ f''(4)= 175(8) + \frac{15}{2}(2) \\ f''(2)=1400+15 \\ f''(2)=1415 [/tex]