Question

if 8 is a root of the equation

Answer 1

$hey \: mate \: here \: is \: your \: answer$
$x {}^{2} - 10x + k = 0$
$on \: putting \: x = - 8$
$( 8) {}^{2} - 10( 8) + k = 0$
$64 - 80 + k = 0$
$- 16 + k = 0$
$k = 16$
$the \: value \: of \: k \: is \: 16$
$hope \: it \: helps.....$

Answer 2

f(x) =x²-10x+k =0
f(8)= (8)²-10*8+k=0
=64-80+k=0
= -16+k =0
k =16