Asked by Mark
Solve the polynomial equation by finding all real roots
x^4+15x^2-16
Many thanks
x^4+15x^2-16
Many thanks
Answers
Answered by
R_scott
let a = x^2 ... a^2 + 15 a - 16 ... (a + 16) (a - 1)
(x^2 + 16) (x^2 - 1) ... (x + 4i) (x - 4i) (x + 1) (x - 1)
(x^2 + 16) (x^2 - 1) ... (x + 4i) (x - 4i) (x + 1) (x - 1)
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