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Find the Values of K for Which the Following Equation Have Real and Equal Root: - Mathematics

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Question

Find the value of k for which the following equations have real and equal roots:

\[x^2 - 2\left( k + 1 \right)x + k^2 = 0\]

Solution

The given quadric equation is `x^2 - 2 (k + 1)x +k^2 = 0`, and roots are real and equal

Then find the value of k.

Here,

a = 1, b=2(k + 1)and,c = k2

As we know that `D = b^2 - 4ac` 

Putting the value of  a = 1,b = -2(k+1)and, c = k2

`={-2(k+1)}^2 - 4 xx 1 xx k^2 `

`={4(k^2 + 2k +1)} - 4k^2`

` = 4k^2 + 8k + 4 - 4^2`

`= 8k + 4`

The given equation will have real and equal roots, if D = 0

8k + 4 = 0

8k = - 4

`k=(-4)/8`

` = (-1)/2`

Therefore, the value of `k = (-1)/2`

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APPEARS IN

 RD Sharma Solution for Class 10 Maths (2018 (Latest))
Chapter 4: Quadratic Equations
Ex. 4.6 | Q: 4.1 | Page no. 42
 RD Sharma Solution for Class 10 Maths (2018 (Latest))
Chapter 4: Quadratic Equations
Ex. 4.6 | Q: 4.1 | Page no. 42
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Find the Values of K for Which the Following Equation Have Real and Equal Root: Concept: Solutions of Quadratic Equations by Factorization.
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