Question

if one root of the quadratic equation x^ - 11x + k = 0 is 9 find the value of k.

Answer 1

9-11×9+k=0
-90+k=0
k=90

Answer 2

given,
one root of the equation=9
x²-11x+k=0
9²-11(9)+k=0
81-99+k=0
18+k=0
k=-18