bettybales1986
14.05.2021 •
Mathematics
Consider the right triangle with hypotenuse 5, horizontal leg , vertical leg , and angle opposite . How can we view as depending on ? How can we view as depending on ? Explain by using appropriate relationships in the triangle and writing both as a function of and as a function of .
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Ответ:
x = -b/2a
We can solve this problem by:
1) Looking at the given graphs of the polynomial functions and looking at where each parabola is cut in half
2) Solving for each axis of symmetry algebraically by first putting each given function into the standard form of ax² + bx + c then solving for the axis of symmetry.
In this problem, I'll be solving for each axis of symmetry algebraically.
The first function: f(x)
f(x) = -4(x - 8)² + 3
f(x) = -4(x - 8)(x - 8) + 3
f(x) = -4(x² - 16x + 64) + 3
f(x) = -4x² + 64x - 256 + 3
f(x) = -4x² + 64x - 253
Axis of symmetry: x = -b / 2a
x = -(64) / 2(-4)
x = -64 / -8
x = 8
Axis of symmetry: x = 8
The second function: g(x)
g(x) = 3x² + 12x + 15
The function function is already in standard form, so just substitute the values into the formula for the axis of symmetry.
x = -b / 2a
x = -(12) / 2(3)
x = -12 / 6
x = -2
Axis of symmetry: x = -2
The third function: h(x)
h(x) = -1(x - 3)² + 2
h(x) = -1(x² - 6x + 9) + 2
h(x) = -x² + 6x - 9 + 2
h(x) = -x² + 6x - 7
Axis of symmetry: x = -b / 2a
x = -b / 2a
x = -(6) / 2(-1)
x = -6 / -2
x = 3
Axis of symmetry: x = 3
Solution: The ranking of the functions based on their axis of symmetry from smallest to largest is g(x), h(x), and f(x).