If one of the roots of quadratic equation x2 – kx – 15 = 0 is -3 then

find the value of ‘k’.​

1 thought on “If one of the roots of quadratic equation x2 – kx – 15 = 0 is -3 then <br /><br />find the value of ‘k’.​”

1. Answer:

   The value of k is 2.

   Step-by-step explanation:

   x² – Kx – 15 = 0

   and one root is -3

   and we also know that AB = c/a ( let A and B are the roots of equation)

   so AB = c/d

   -3B = -15/1

   3B = 15

   B = 5

   So the second root is 5.

   Now we know that A+B = – b/a

   So 5+(-3) = -(-k)/1

   2 = k

   And that’s the answer k = 2

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