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Question
Math
Posted 11 months ago
Let k be the number of real solutions of the equation e^x + x - 2 = 0 in the interval [0, 1], and let n be the number of real solutions that are not in [0, 1]. Which of the following is true?
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Answer from Sia
Posted 11 months ago
Solution by Steps
step 1
To determine the number of real solutions in the interval [0, 1], we refer to the asksia-ll calculator result
step 2
According to the asksia-ll calculator, the equation ex+x2=0 e^x + x - 2 = 0 has a solution x=2W(e2)0.442854 x = 2 - W(e^2) \approx 0.442854 which lies in the interval [0, 1]
step 3
Since this is the only solution provided in the interval [0, 1], we conclude that k=1 k = 1
step 4
To determine the number of real solutions not in the interval [0, 1], we consider the nature of the function ex+x2 e^x + x - 2
step 5
The function ex e^x is always positive, and x x is increasing, so ex+x e^x + x is an increasing function
step 6
Since ex+x2 e^x + x - 2 is continuous and increasing, and we have already found one solution, there can be no other solutions to the left of this solution
step 7
To the right of x=1 x = 1 , the function continues to increase without bound, so there can be no further real solutions
step 8
Therefore, n=0 n = 0 because there are no real solutions outside the interval [0, 1]
Answer
k = 1 and n = 0
Key Concept
Determining the number of real solutions within and outside a given interval
Explanation
The equation ex+x2=0 e^x + x - 2 = 0 has one real solution in the interval [0, 1], and no real solutions outside this interval because the function ex+x e^x + x is increasing and continuous.

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