If the Zeros of the Polynomial x²+px+q are Double in Value to the Zeros of 2x²-5x -3, Find the Value of p and q
By BYJU'S Exam Prep
Updated on: October 17th, 2023
If the zeroes of the polynomial x²+px+q are double in value to the zeroes of 2x²-5x -3, find the value of p and q
Here are the steps in brief to find the values of p and q:
Step 1: Set the zeros of the polynomial x² + px + q as α and β.
Step 2: Express the relationship between the zeros of 2x² – 5x – 3 and x² + px + q as α = 2α’ and β = 2β’, where α’ and β’ are the zeros of 2x² – 5x – 3.
Step 3: Find the zeros of 2x² – 5x – 3 by factoring or using the quadratic formula. In this case, we have x = -1/2 and x = 3 as the zeros.
Step 4: Multiply the zeros of 2x² – 5x – 3 by 2 to obtain the values of α and β. This gives α = -1 and β = 6.
Step 5: The value of p is the sum of the zeros, p = α + β and the value of q is the product of the zeros, q = α * β
Table of content
If the Zeros of the Polynomial x²+px+q are Double in Value to the Zeros of 2x²-5x -3, Find the Value of p and q
Solution:
Let’s denote the zeros of the polynomial x² + px + q as α and β.
Given that the zeros of 2x² – 5x – 3 are double in value to the zeros of x² + px + q, we can express this relationship as follows:
α = 2α’ β = 2β’
Here, α’ and β’ represent the zeros of 2x² – 5x – 3.
Now, let’s find the zeros of 2x² – 5x – 3. We can either use factoring or the quadratic formula. Using factoring, we have:
2x² – 5x – 3 = (2x + 1)(x – 3)
Setting each factor equal to zero and solving for x, we find the zeros of 2x² – 5x – 3:
2x + 1 = 0
x = -1/2
x – 3 = 0
x = 3
Therefore, the zeros of 2x² – 5x – 3 are x = -1/2 and x = 3.
Since α and β are double the values of α’ and β’, we can express this relationship as:
α = 2(-1/2) = -1
β = 2(3) = 6
Thus, the value of p is the sum of the zeros: p = α + β = -1 + 6 = 5.
Similarly, the value of q is the product of the zeros: q = α * β = -1 * 6 = -6.
Therefore, the values of p and q are p = 5 and q = -6.
Answer:
If the Zeros of the Polynomial x²+px+q are Double in Value to the Zeros of 2x²-5x -3, then the Value of p and q are 5 and -6
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