Complex Roots

Algebra Level 2

Let a+bia+bi and c+dic+di be the two roots of the quadratic equation ix2+(67i)x219i=0,ix^2+(6-7i)x-21-9i=0, where a<ca<c. What is the value of ad+bc?ad+bc?

ii is the imaginary number that satisfies i2=1.i^2 = -1.

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