Prove that the function f(x)=x4−4x3+6x2−4x+1 has no real roots.
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Answer from Sia
Posted 4 months ago
Solution by Steps
step 1
To prove that the function f(x)=x4−4x3+6x2−4x+1 has no real roots, we can analyze the function by checking its discriminant or by evaluating its behavior
step 2
We can rewrite the function as f(x)=(x−1)4, which is a perfect square
step 3
Since (x−1)4≥0 for all real x, the function f(x) is always non-negative
step 4
The only point where f(x)=0 is at x=1, which is a double root. Thus, there are no real roots where f(x) changes sign
Answer
The function f(x)=x4−4x3+6x2−4x+1 has no real roots except at x=1, which is a double root.
Key Concept
A polynomial function can have real roots where it changes sign, and analyzing its structure can reveal the nature of its roots.
Explanation
The function is always non-negative and only touches the x-axis at x=1, indicating it does not have distinct real roots.
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