Question

If 3 is one of the roots of a quadratic equation X^2-2x+k is ____
A) 3
B) 9
C) -3
D) -9

Answer 1

Answer:

c) If 3 is one of the roots of a quadratic equation X^2-2x+k is -3.

Step-by-step explanation:

Given its one root of the equation $X^2-2x+k = 0$

one of its root x = 3

for finding the value of k put the value of x in this equation.

$X^2-2x+k = 0\\(3)^2 - 2(3) + k=0\\9 - 6 + k=0\\3 + k = 0\\k = -3$

So, the value of k is -3.

Answer 2

Answer:

The option (c) -3 is the answer

Step-by-step explanation:

In accordance with the information provided in the question,

Given the data in question if 3 is one of the roots of a quadratic equation X^2-2x+k is

As we get

$x^{2} -2x+k$$=0$

We have put the value of x=3 in  the above equation

And we have find the value of  k in the above equation

We get,

$x^{2} -2x+k=0\\(3)^{2} -2\times 3+k=0\\9-6+k=0\\3+k=0\\k=0-3\\k=-3$

Hence we will get the value of k $= -3$