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Q.

If the minimum value of ⨍ x=2x2+αx+8 is the same as the maximum value of g(x)=-3x2-4x+α2, then α2=

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a

15027

b

16027

c

17027

d

18127

answer is B.

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Detailed Solution

⨍ (x)=2x2+αx+8 ⨍ 1(x)=4x+α

⨍ (x) is min or max

⨍ 1(x)=0 x=-α4

min or ⨍ (x) is

=2α216+α-α4+8 =α2-2α2+648 =64-α28 g(x)=-3x2-4x+α2 g1(x)=-64-4

g(x) is min or max

g1(x)=0 x=-23 g(x)=-3×49+83+α2 =43+α2

given min ⨍ (x)= max g(x)

64-α28=43+α2 192-3α2=32+24α2 27α2=160α2=16027

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