Use the Remainder Theorem to find the remainder when​ f(x) is divided by x-c

Question

f(x)=5x⁶-3x³+8;x+1

Answer 1

the remainder is divided by x-c to complete the division

f(x)/(x-c)=g(x)+f(c)/(x-c)

Answer 2

Use synthetic substitution to determine f(-1) = ?