Find the value of k, for which 3 is a root of the equation kx²-7x+3=0.

 Since 3 is a root of the quadratic equation kx²-7x+3=0, then k(3)²-7(3)+3=0

=> 9k-21+3=0 => 9k-18=0

=> 9k=18 => k= 2 Ans.

[If α is a root or zero of a quadratic equation P(x)=0, then P(α)=0]