Question

If x – 3 is factor of x2 – Kx – 15. Find K​

Answer 1

Answer:

X=3

x²-kx-15=0

3²-3k-15=0

3k= 9-15

k= -6/3

So, k= -2

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Answer 2

Step-by-step explanation:

Since x-3 is a factor of x²-kx-15

Then x - 3 = 0 =≥ x = 3

Put x = 3 in p(x) =0

3² - 3k - 15 = 0

9 - 3k - 15 = 0

-3k - 6 = 0

k = -2

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