8sfzmbryvz 8sfzmbryvz 18-12-2022 Mathematics Answered - 5) f(x) = 4x³ + ax² + 13x + b f(x) has a factor of (2x - 1) and leaves a remainder of 21 when divided by a. Find the value of a and b. b. Find the remainder when the expression is divided by (x+1).