13. Find (f . g)(x) if f(x)=7x³-5x²+42x-30 and g(x)=7x-5.
(f . g)(x)=49x⁴-269x²-150
(f . g)(x)=49x⁴+269x²+150
(f . g)(x)=49x⁴-70x³+319x²-420x+150
(f. g)(x)=49x⁴+70x³-319x²+420x-150