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Statement 1: The quadratic polynomial y=...

Statement 1: The quadratic polynomial `y=ax^(2)+bx+c(a!=0` and `a,b in R)` is symmetric about the line `2ax+b=0`
Statement 2: Parabola is symmetric about its axis of symmetry.

A

Statement -1 is true, Statement -2 is true, Statement -2 is a correct explanation for Statement-1

B

Statement -1 is true, Statement -2 is true, Statement -2 is not a correct explanation for Statement -1

C

Statement -1 is true, Statement -2 is false

D

Statement -1 is false, Statement -2 is true

Text Solution

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The correct Answer is:
To solve the problem, we need to analyze the two statements given about the quadratic polynomial and the parabola. ### Step 1: Understanding the Quadratic Polynomial The quadratic polynomial is given by: \[ y = ax^2 + bx + c \] where \( a \neq 0 \) and \( a, b, c \in \mathbb{R} \). ### Step 2: Finding the Axis of Symmetry The axis of symmetry for a quadratic polynomial in the form \( y = ax^2 + bx + c \) can be found using the formula: \[ x = -\frac{b}{2a} \] This means that the parabola is symmetric about the vertical line \( x = -\frac{b}{2a} \). ### Step 3: Rewriting the Polynomial We can rewrite the polynomial in a way that highlights its vertex. Completing the square: \[ y = a\left(x^2 + \frac{b}{a}x\right) + c \] To complete the square: \[ = a\left(x^2 + \frac{b}{a}x + \left(\frac{b}{2a}\right)^2 - \left(\frac{b}{2a}\right)^2\right) + c \] \[ = a\left(\left(x + \frac{b}{2a}\right)^2 - \left(\frac{b}{2a}\right)^2\right) + c \] \[ = a\left(x + \frac{b}{2a}\right)^2 - \frac{b^2}{4a} + c \] ### Step 4: Identifying the Vertex The vertex of the parabola is at: \[ \left(-\frac{b}{2a}, c - \frac{b^2}{4a}\right) \] The axis of symmetry is the vertical line \( x = -\frac{b}{2a} \). ### Step 5: Analyzing Statement 1 Statement 1 claims that the quadratic polynomial is symmetric about the line \( 2ax + b = 0 \). Rearranging gives: \[ x = -\frac{b}{2a} \] This is indeed the axis of symmetry we found in Step 2. Thus, Statement 1 is **true**. ### Step 6: Analyzing Statement 2 Statement 2 states that a parabola is symmetric about its axis of symmetry. Since we have established that the axis of symmetry for the parabola defined by the quadratic polynomial is \( x = -\frac{b}{2a} \), it follows that the parabola is symmetric about this line. Thus, Statement 2 is also **true**. ### Conclusion Both statements are true: - Statement 1: True - Statement 2: True

To solve the problem, we need to analyze the two statements given about the quadratic polynomial and the parabola. ### Step 1: Understanding the Quadratic Polynomial The quadratic polynomial is given by: \[ y = ax^2 + bx + c \] where \( a \neq 0 \) and \( a, b, c \in \mathbb{R} \). ### Step 2: Finding the Axis of Symmetry ...
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