# Find the Values of K for Which the Roots Are Real and Equal in Each of the Following Equations: - Mathematics

Find the values of k for which the roots are real and equal in each of the following equation:

$4 x^2 - 2\left( k + 1 \right)x + \left( k + 1 \right) = 0$

#### Solution

The given equation is $4 x^2 - 2(k + 1)x + (k + 1) = 0$ where a = 4, b = -2(k+1), c = (k+1)
As we know that D = b2 - 4ac
Putting the value of a = 4, b = -2(k+1), c = (k+1)

$\left\{ - 2(k + 1) \right\}^2 - 4 \times 4 \times (K + 1)$

$4(K + 1 )^2 - 16(K + 1)$

$(K + 1)\left\{ 4(K + 1) - 16 \right\}$

$(K + 1)(4K - 12)$

$4(K + 1)(K - 3)$

For real and equal roots D = 0

$4\left( K + 1 \right)\left( K - 3 \right) = 0$

$K = - 1 \text { or } k = 3$

Therefore, the value of

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#### APPEARS IN

RD Sharma Class 10 Maths
Chapter 4 Quadratic Equations
Exercise 4.6 | Q 2.16 | Page 41