In a high school math classroom, the teacher wrote a quadratic equation on the blackboard forthe students to solve. Anna mistakenly wrote a different coefficient for the ๐ฅ term in the equationand got the roots as 2 and 3. Suresh made a mistake in writing the constant term and got theroots as 3 and 4. What are the roots of the equation which the teacher wrote?
Question
In a high school math classroom, the teacher wrote a quadratic equation on the blackboard forthe students to solve. Anna mistakenly wrote a different coefficient for the ๐ฅ term in the equationand got the roots as 2 and 3. Suresh made a mistake in writing the constant term and got theroots as 3 and 4. What are the roots of the equation which the teacher wrote?
Solution
To find the roots of the equation that the teacher wrote, we need to analyze the mistakes made by Anna and Suresh.
Let's start with Anna's mistake. She wrote a different coefficient for the ๐ฅ term in the equation. This means that the equation she solved can be represented as ๐๐ฅ^2 + ๐๐ฅ + ๐ = 0, where ๐ is the correct coefficient and ๐ is the coefficient Anna mistakenly wrote.
Anna's roots are given as 2 and 3. We can use these roots to form two equations:
(1) ๐(2)^2 + ๐(2) + ๐ = 0 (2) ๐(3)^2 + ๐(3) + ๐ = 0
Simplifying these equations, we get: (1) 4๐ + 2๐ + ๐ = 0 (2) 9๐ + 3๐ + ๐ = 0
Now let's move on to Suresh's mistake. He made an error in writing the constant term. This means that the equation he solved can be represented as ๐๐ฅ^2 + ๐๐ฅ + ๐ = 0, where ๐ is the correct constant term and ๐ is the constant term Suresh mistakenly wrote.
Suresh's roots are given as 3 and 4. Using these roots, we can form two equations:
(3) ๐(3)^2 + ๐(3) + ๐ = 0 (4) ๐(4)^2 + ๐(4) + ๐ = 0
Simplifying these equations, we get: (3) 9๐ + 3๐ + ๐ = 0 (4) 16๐ + 4๐ + ๐ = 0
Now we have a system of four equations: (1) 4๐ + 2๐ + ๐ = 0 (2) 9๐ + 3๐ + ๐ = 0 (3) 9๐ + 3๐ + ๐ = 0 (4) 16๐ + 4๐ + ๐ = 0
To solve this system, we can subtract equation (2) from equation (1) to eliminate ๐: (1) - (2) => -5๐ - ๐ = 0
Similarly, subtracting equation (4) from equation (3) eliminates ๐: (3) - (4) => -7๐ - ๐ = 0
Now we have a system of two equations: -5๐ - ๐ = 0 -7๐ - ๐ = 0
Solving this system, we find that ๐ = 0 and ๐ = 0.
Substituting these values back into any of the original equations, we can find the value of ๐ or ๐. Let's use equation (1): 4(0) + 2(0) + ๐ = 0 ๐ = 0
Therefore, the equation that the teacher wrote is ๐๐ฅ^2 + ๐๐ฅ + ๐ = 0, which simplifies to ๐ฅ^2 = 0.
The roots of this equation are 0 and 0.
Similar Questions
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A and B solved a quadratic equation with the leading coefficient 1. In solving it, A made a mistake in the constant term and obtained the roots as (5, โ3) while B made a mistake in the coefficient of x and obtained the roots as (1, โ3). The correct roots of the equation are:
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