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bazaltina [42]
3 years ago
11

The average income, I, in dollars, of a lawyer with an age of x years is modeled with the following function:

Mathematics
1 answer:
Alinara [238K]3 years ago
3 0
The answer is 37 years old.

I = -425x² + 45500x -650000
I = 450000

-425x² + 45500x -650000 = 450000
-425x² + 45500x - 650000 - 450000 = 0
-425x² + 45500x - 1100000 = 0

Divide all factors by 25:
- 17x² + 1820x - 44000 = 0

This is quadratic equation (ax² + bx + c = 0)
x_{1,2} = \frac{-b+/- \sqrt{ b^{2}-4ac } }{2a} = \frac{-1820+/- \sqrt{ 1820^{2}-4*(-17)*(-44000) } }{2*(-17)} = \\  \\ = \frac{-1820+/- \sqrt{3312400-2992000 } }{-34} = \frac{-1820+/- \sqrt{320400} }{-34} =\frac{-1820+/- 566}{-34}  \\  \\ 
x_1= \frac{-1820+ 566}{-34}= -37 \\  \\ 
x_2 = \frac{-1820- 566}{-34}=70

Since, the youngest age is needed, the correct answer is x = 37
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