Question

What is the product of the roots of x^2-4x+k =0 if one of the roots is 7?

Answer 1

first, subtitute x = 7 into the equaiton :
x^2-4x+k =0
(7)^2-4(7)+k =0
solve for k ?

Answer 2

product of roots=k
sum of roots
x1+x2=-(-4)/1=4
x1+x2=4
let x1=7
find x2
product=x1*x2

Answer 3

K= -21?

Answer 4

yeah

Answer 5

Then what do I do?

Answer 6

that is product of ur roots that's it