Question

x²-x(a+b)+k=0
The value of x is x=a

Answer 1

Answer:

k= -ab

Step-by-step explanation:

sub x value in problem

$a {}^{2} - a(a + b) + k = 0 \\ a {}^{2} - a {}^{2} - ab + k = 0 \\ - ab + k = 0 \\ k = - ab$