Step-by-step explanation:
4(-2+7x) = 5(32)
-8 + 28x = 160
28x = 160+8
28x = 168
x = 168/28
= 42/7
= 6
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