F(x)=3x 2+x

Find f(−5)

Given,

Now, we have to find f (-5). To find this, we just need to substitute -5 in the place of x.

So,

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