The range of function y = 2 - √ (- x ^ + 4x)

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• 2. For the function y = f (x), if there is an interval [a, b], when x ∈ [a, b], the value range of F (x) is [Ka, KB] (k > 0), then y = f (x) is called k-times value function. If f (x) = LNX + X is k-times value function, then the value range of real number k is______ ．
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• 5. Given the function f (x) = x ^ 2-6x + 2, find the range of function f (x)
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• 8. The range of function y = log 0.5 (x ^ 2 + 2x + a) is r, and the range of a is obtained
• 9. It is known that the value range of the function y = log with the base of 0.5 (x ^ 2-2x + a) is r, and the value range of a is obtained
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• 11. The range of function y = x square + 5x + 6 Such as the title
• 12. How to draw piecewise function with absolute value? It's better to sum up the rules,
• 13. How can a function with absolute value be expressed as a piecewise function For example, how does f (x) = | x | / x + X become a piecewise function
• 14. Is the function with absolute value necessarily segmented?
• 15. On writing piecewise function with absolute value removed |Why is X & # 178; - 4x | written as X & # 178; - 4x (x ≤ 0) - X & # 178; + 4x (0 ＜ x ＜ 4), X & # 178; - 4x (x ≥ 4) I know this is the form of piecewise function. I just don't know how to get rid of the absolute value to write this form. Don't tell me the answer directly according to the image. I want to know the effective method and idea to solve this problem
• 16. On the problem of absolute value piecewise function Function y = x + 1 + X-2 (1) Why is the - 2x + 1 domain x less than - 1 y= (2) 3 (3) Why is 2x-1 domain x greater than or equal to 2
• 17. The range of the function y = 3x-1 / X
• 18. The range of the square + 2x + 3 of the function y = x is
• 19. To find the range of the function y = x ^ 2 / x ^ 2 + 1 (the square of x plus the square of 1 / 2 of x), I use x ^ 2 = Y / y + 1 to find the range of [0.1] Then I use another method to change the original formula to 1 / y = 1 + 1 / x ^ 2, but the result is wrong. What's wrong with this method? I know how to calculate it. I use the second method to solve 1 / 2, but I just can't figure out what's wrong with the second method.
• 20. Y = 3x-2 / x + 1 (x > 0)