Question

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

Answer 1

take -3 out as a common factor

-3(x^4 - 9x^2 - 400) = 0

then factor the brackets... this is basically a quadratic

-3(x^2 - 25)(x^2 + 16) = 0

just solve for x

Answer 2

Thanks!!