Find the value of k, for which one root of the quadratic equation kx -

1.	Find the value of k, for which one root of the quadratic equation kx -14x#8 0 is 2.is 2.ORFind the value(s) of k for which the equation x2 + 5kx + 16 = 0 has real and equal roots.
Answer» 2 is a root so if we put x=2 we will get o as an answer 4k-28+8 = 0 4k = 20 k = 5 xx+5kx+16 = 0 equal roots so bb = 4ac 25kk = 64 kk = 64/25 k = 8/5 or -8/5 thanks yr

Find the value of k, for which one root of the quadratic equation kx -14x#8 0 is 2.is 2.ORFind the value(s) of k for which the equation x2 + 5kx + 16 = 0 has real and equal roots.

Answer»

2 is a root so if we put x=2 we will get o as an answer 4k-28+8 = 0 4k = 20 k = 5

x*x+5kx+16 = 0 equal roots so b*b = 4ac 25k*k = 64 k*k = 64/25 k = 8/5 or -8/5

thanks yr