Question 337506
5x^3+4x^2=20x+16
5x^3+4x^2-20x-16=0
x^2(5x+4)-4(5x+4)=0
(5x+4)(x^2-4)=0
(5x+4)(x+2)(x-2)=0
x= -4/5, -2,+2
D is correct