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Q.

The nature of the roots of the equation (x2–6x+9)2 = x3–4x2+9x is

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a

two multiple real roots

b

two real and two complex roots

c

no real roots

d

four real roots

answer is C.

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Detailed Solution

the given equation is (x2–6x+9)2 = x3–4x2+9x 

x26x+92=xx26x+9+2x2

Take x2 – 6x + 9 = y.

Then y2 – xy – 2x2 = 0 y = 2x, –x

x26x+9=2xx28x+9=0 Roots real and distinct and x26x+9=xx25x+9=0

Roots are conjugate complex numbers.

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