Factor the expression using the gcf. 21a squared b to the 5th power + 49a to the 4th power b cubed

mental cunning

explanation:

he is often referred to as a man of twists and turns

f(x) = x^3 -2x^2 -3x

x( x^2 -2x-3)

x( x^2 +x -3x -3)

x( x(x+1) -3(x+1))

x( x-3)( x+1)

so zeroes are 0, 3,-1

its (2) option