If z_1 = 9y^2 - 4 - 10ix, z_2 = 8y^2 - 20i, where z_1 = z_2, then z = x+iy is equal to

JEE Advanced Mathematics question

If , , where , then is equal to

Answer: (B)

( real.) . Equate real and imaginary parts of : - Real: $ - 4 =

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Question ID VK-108047