Question

check whether (x+3) is a factor of f(x)=x³-3x ²+4x +50​

Answer 1

x+3=0
x=-3
Substituting this in the equation
f(-3)=(-3)^3-3(-3)^2+4(-3)+50
f(-3)=-27-3(9)-12+50
f(-3)=-27-27-12+50
f(-3)=-66+50
f-3)=-16

So x+3 is not the factor of x^3-3x^2+4x+50