How to find the largest value of the function y = 9x + 16 / x on the segment [-3, -0.2]?
September 14, 2021 | education
| 1) Find the derivative of the function: y ‘= 9 – 16 / x ^ 2 and equate it to zero.
Solving the resulting equation, we get the roots: x1 = -4/3 and x2 = 4/3
Of these, only x1 belongs to the segment [-3, -0.2]. The second root (x2) is not considered.
Let’s find the value of the function at the point x1:
y (-4/3) = -24
2) Find the values of the function at the boundaries of the interval:
y (-3) = -32,333 …
y (-0.2) = -81.8
3) Choose the largest value from the numbers {-24; -32.3 (3); -81.8}
Received -24.
Thus, the function takes the largest value on the segment at the point x = -4 / 3 and it is equal to -24.
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