Asksia AI LOGO

Sia

2542063136's Question
Math
Posted 4 months ago
Prove that the function f(x)=x44x3+6x24x+1f(x) = x^4 - 4x^3 + 6x^2 - 4x + 1 has no real roots.
Sign in to unlock the answer
Answer from Sia
Posted 4 months ago
Solution by Steps
step 1
To prove that the function f(x)=x44x3+6x24x+1f(x) = x^4 - 4x^3 + 6x^2 - 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)=(x1)4f(x) = (x-1)^4, which is a perfect square
step 3
Since (x1)40(x-1)^4 \geq 0 for all real xx, the function f(x)f(x) is always non-negative
step 4
The only point where f(x)=0f(x) = 0 is at x=1x = 1, which is a double root. Thus, there are no real roots where f(x)f(x) changes sign
Answer
The function f(x)=x44x3+6x24x+1f(x) = x^4 - 4x^3 + 6x^2 - 4x + 1 has no real roots except at x=1x = 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=1x = 1, indicating it does not have distinct real roots.

Not the question you are looking for? Ask here!

Enter question by text

Enter question by image

Unlock Smarter Learning with AskSia Super!

Join Super, our all-in-one AI solution that can greatly improve your learning efficiency.

30% higher accuracy than GPT-4o
Entire learning journey support
The most student-friendly features
Study Other Question