Polynomial started

Algebra Level 4

What are the roots of the equation x 4 ( a b + c + d ) x 3 + ( c d b c b d + a c + a d a b ) x 2 ( b c d + a c d a b c a b d ) x a b c d = 0 ? x^4-(a-b+c+d)x^3+(cd-bc-bd+ac+ad-ab)x^2 \\ -(-bcd+acd-abc-abd)x-abcd=0?

a , b , c , d -a, -b, c, d a , b , c , d a, b, c, d a , b , c , d -a, b, -c, -d b , c b,c c , d c,d a , b , c , d a, -b, c, d a , d a,d a , b a, b

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1 solution

The solution directly follows applying Vieta's formula .

This equation can be written as ( x a ) ( x + b ) ( x c ) ( x d ) = 0 (x - a)(x + b)(x - c)(x - d) = 0 \Rightarrow the solutions or roots of this equation are a , b , c , d a , -b , c , d

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