What value of k makes the factor (x+3) a factor of the function f(x)= 3x^3–2x+k? someone plz it’s for pre cal! it’s using the synthetic division

Adam plans to choose a video game from the section of the store where everything is 75% off. he writes the expression d-0.75d to find the sale price of the game if the original price is d dollars. gena correctly writes another expression, 0.25d, that will also find the sale price of the game if the original price is d dollars. use the drop down menus to explain each part of adams and rena's expression