Question 982451
y=0?


(x^2+2x-7)=0?
Either factorize further or use formula for general solution.  Not factorable, so use formula for general solution of quadratic equation.


x^3+4x^2-21x=0?
First factor into x(x^2+4x-21)=0 and then either factorize the quadratic factor or use formula for general solution.  (Factoring will work here).