Question

Use the factor and remainder theorem. ​

Answer 1

a

Explanation:

x3+2x2-19x-20

x3+x2+x2+x-20x-20

x2(x+1)+x(x+1)-20(x+1)

(x2+x-20)(x+1)

(x2+5x-4x-20)(x+1)

(x(x+5)-4(x+5))(x+1)

(x-4)(x+5)(x+1)