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If the biquadratic x^4 + ax^3 + bx^2 + cx + d = 0 (a, b, c, d ∈ R) has 4 non real roots, two with sum 3 + 4i

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If the biquadratic x4 + ax3 + bx2 + cx + d = 0 (a, b, c, d ∈ R) has 4 non real roots, two with sum 3 + 4i and the other two with product 13 + i. Find the value of ‘b’.

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x4 + ax3 + bx2 + cx + d has 4 non-real roots

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