## Algebra 2 (1st Edition)

$$f(x)=3x^3-3x^2+75x-75=0\\3x^2(x-1)+75(x-1)=0\\(x-1)(3x^2+75)=0\\(x-1)(x^3+25)=0$$ Then we have: $x-1=0 \rightarrow x=1$ is the only solution of this equation.