Question

find the value of k for which one root of the root of quadratic equation kx 2-14x+8 =0 is 2
Plzzz answer

Answer 1

Answer:

Equation: kx² - 14x + 8 = 0

Also given that, one of the roots is 2.

Substituting the value of 2 instead of x we get,

⇒ k ( 2 )² - 14 ( 2 ) + 8 = 0

⇒ 4k - 28 + 8 = 0

⇒ 4k - 20 = 0

⇒ 4k = 20

⇒ k = 20 / 4

⇒ k = 5

Hence the value of k must be 5.

Hope it helped !

Answer 2

Here is your solution

Given Equation:-

kx² - 14x + 8 = 0

one of the roots is 2

Now

putting the value of 2 in place of x we get:-

=>k ( 2 )² - 14 ( 2 ) + 8 = 0

=>4k - 28 + 8 = 0

=>4k - 20 = 0

=>4k = 20

=>k = 20 / 4

=>k = 5

Hence,

The value of k is  5.

Hope it helps you