The range of function y = log ^ 2, x, X ∈ (0,8) is (log is based on 2)

The range of function y = log ^ 2, x, X ∈ (0,8) is (log is based on 2)

Answer: ∵ function y is a monotone increasing function on x > 0
When x = 8, y = 3
So the range of Y is (negative infinity, 3]

Find the monotone interval and range of function y = log with 1 / 3 base (- x Λ 2 + 4x + 5)
Within today

Let - x ^ 2 + 4x + 5 = t > 0, so - 1

The range of the function y = log with the base of 0.. 5 (x + 1 / x + 1 + 1) (x > 1) is

y=log0.5【（x+1）+1/(x+1)】
Domain {x | x > - 1} (x + 1) + 1 / (x + 1) > = 2 log0.5 [(x + 1) + 1 / (x + 1)]

The father is 47 years old and the son is 21 years old. How many years ago was the father three times as old as the son?

Eight years ago (47-21 = 26, X-Y = 26, x = 3Y) solve the equation