Question

If x=3 is the solution of x2+kx+15, the value of k is:

Answer 1

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✴If x = 3 then 3² + 3k + 15 =0

✴ 9 + 3k + 15 = 0

✴ 9 + 3k = -15

✴ 3k = -24

✴ k = -24/3

➡️ k = -8