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Q.

If x is real, then maximum value of 3x2+9x+173x2+9x+7 is

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a

177

b

41

c

1

d

14

answer is C.

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Detailed Solution

⨍ (x)=3x2+9x+173x2+9x+7=y 3x2+9x+17=3x2y+9xy+7y 3x2(1-y)+9x(1-y)+17-7y=0 0 81(1-y)2-4×3(1-y)(17-7y)0 (1-y)27(1-y)-4(17-7y)0 (1-y)27-27y-68+28y0 (1-y)y-410 (y-1) (y-41)  0

1y41

max value = 41

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