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Q.

If Δ=−a2b00−a2b2b0−a=0 then

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a

1/b is a cube root of unity.

b

a is one of the cube roots of unity

c

b is one of the cube roots of 8

d

a/b is a cube root of 8

answer is D.

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Detailed Solution

Show Δ=−a3+8b3Thus, Δ=0⇒ab3=8⇒ a/b is a cube root of 8.
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