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Consider the following statements in res...

Consider the following statements in respect of the given equation.
`(x^(2) + 2)^(2) + 8x^(2) = 6x (x^(2) + 2)`
1. All the root of the equation are complex.
2. The sum of the all the roots of the equation is 6.
Which of the above statements is/are correct ?

A

a) Only I

B

b) Only II

C

c) Both I and II

D

d) Neither I nor II

Text Solution

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The correct Answer is:
To solve the equation \((x^2 + 2)^2 + 8x^2 = 6x(x^2 + 2)\) and analyze the statements, we will follow these steps: ### Step 1: Expand the equation We start by expanding both sides of the equation. 1. Left-hand side: \[ (x^2 + 2)^2 + 8x^2 = (x^4 + 4x^2 + 4) + 8x^2 = x^4 + 12x^2 + 4 \] 2. Right-hand side: \[ 6x(x^2 + 2) = 6x^3 + 12x \] Now, we can rewrite the equation as: \[ x^4 + 12x^2 + 4 = 6x^3 + 12x \] ### Step 2: Rearrange the equation Next, we rearrange the equation to set it to zero: \[ x^4 - 6x^3 + 12x^2 - 12x + 4 = 0 \] ### Step 3: Analyze the roots of the polynomial To determine the nature of the roots, we can use the discriminant or analyze the behavior of the polynomial. 1. **Finding the discriminant**: We can use the discriminant of the polynomial. However, for a quartic polynomial, this can be complex. Instead, we can check the values of the polynomial at certain points to see if it changes signs. 2. **Evaluate at specific points**: - \(f(0) = 4\) - \(f(1) = 1 - 6 + 12 - 12 + 4 = -1\) Since \(f(0) > 0\) and \(f(1) < 0\), by the Intermediate Value Theorem, there is at least one real root between \(0\) and \(1\). ### Step 4: Sum of the roots Using Vieta's formulas, the sum of the roots of the polynomial \(ax^4 + bx^3 + cx^2 + dx + e = 0\) is given by \(-\frac{b}{a}\). Here, \(a = 1\) and \(b = -6\): \[ \text{Sum of roots} = -\frac{-6}{1} = 6 \] ### Conclusion Now we can evaluate the statements: 1. **Statement 1**: All the roots of the equation are complex. **False** (since we found at least one real root). 2. **Statement 2**: The sum of all the roots of the equation is 6. **True**. Thus, the correct answer is that only Statement 2 is true.
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