Question

If one of the roots of kx²–7x+3=0 is 3, then k = ......,select a proper option (a), (b), (c) or (d) from given options so that the statement becomes correct.
(a) -2
(b) 3
(c) -2
(d) 2

Answer 1

(d)2 is the correct answer.

Answer 2

Option ( d ) is correct.

Explanation :

Given

Quadratic equation kx²-7x+3=0

and 3 is one root of above equation.

Therefore ,

put x = 3 in the equation , we get

k × ( 3² ) - 7( 3 ) + 3 = 0

=> 9k - 21 + 3 = 0

=> 9k - 18 = 0

=> 9k = 18

=> k = 18/9

=> k = 2

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