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In quadratic form, the equation would be -5x2 + x4 + 4 = 0

Wouldn´t this equation written in this way x^4-5x^2+4=0

But you would have to have the equation in ax^2 + bx + c form

If this equation has the form above so try to factor out.

-5x2 + x4 + 4 = 0. From here you can use (x^2-4)(x^2-1);

Reminder if ab=0 then a=0 or b=0

Two different ways of solving but the same answer.