Question

if the roots of the quadratic equation K + 1 x square - 2 k - 1 X + Y is equal to zero at the real and equal find the value of the Kaya

Answer 1

For having real roots D >0
b^2-(4*a*c) > 0
(-2(k-1))^2 - 4*(k+1)*(1) > 0
4(k^2-2k+1) - 4(k+1) > 0
k^2-3k > 0
:. k > 0 or 3
:. k > 3