Question

Find all the zeros of the equation.
-3x^4+27x^2+1200=0

Answer 1

Try a substitution.
Let \(u = x^2\). Then, \(u^2 = x^4\).
Make those substitutions. Then you'll have a quadratic equation in u. Solve for u.
Also notice that -3, 27, and 1200 are all divisible by -3.