Q1 of 65 Page 10

In each of the following cases, let us justify & write whether the given values are the of the given quadratic equation:

and 4/3

We know that the roots of the quadratic equation satisfies the equation.

So, if and are the roots of


then they must satisfy the equation.


Therefore, putting in the equation we have


= = = which is not equal to .


So, it is not a root of the equation.


Putting in the equation we have


= = which is not equal to .


So, it is also not a root of the equation.


Hence, and are not the roots of the equation.


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Let us calculate and write the value of k for which 2/3 will be a root the quadratic equation 7x2 + kx – 3 = 0.