Which equation is represented by the phrase “two times a number equals six”?

2 + x = 6
x = 2 + 6
2x = 6
x = 6

The equation 2x=6 represents two times a number equals six because x is an unknown variable which is "a number" and it is multiplied by two which is "two times" and then that is set equal to six.

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