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IF the roots of the equation x^2+a^...

IF the roots of the equation ` x^2+a^2 =8x + 6a ` are real , then a lies between

A

[2, 9]

B

[-2, 8]

C

[0, 7]

D

[6, 8]

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The correct Answer is:
B
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AAKASH SERIES-QUADRATIC EQUATIONS & EXPRESSIONS-EXERCISE-I
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  17. The smallest value of x^(2) - 3x + 3 in the interval [-3, (3)/(2)] is

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