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Question

Question: Maximum value of the expression <img src="https://cdn.pureessence.tech/canvas_68.png?top_left_x=141...

Maximum value of the expression

is equal to

A

1

B

2

C

10

D

Not defined

Answer

1

Explanation

Solution

f(x) = 10x12+2+3x4+3x4+1x12\frac { 10 } { x ^ { 12 } + 2 + 3 x ^ { 4 } + \frac { 3 } { x ^ { 4 } } + \frac { 1 } { x ^ { 12 } } }

= 10x12+3x4+3x4+1x12+2=10(x4+1x4)3+2\frac { 10 } { x ^ { 12 } + 3 x ^ { 4 } + \frac { 3 } { x ^ { 4 } } + \frac { 1 } { x ^ { 12 } } + 2 } = \frac { 10 } { \left( x ^ { 4 } + \frac { 1 } { x ^ { 4 } } \right) ^ { 3 } + 2 }

Q x4 + 1x4\frac { 1 } { x ^ { 4 } } ³ 2 Ž (x4+1x4)3\left( x ^ { 4 } + \frac { 1 } { x ^ { 4 } } \right) ^ { 3 } + 2 ³ 10

\ f(x) £ 1010\frac { 10 } { 10 } = 1