PRC-2 · Chapter 1 · Question 44 of 45
If x = 5 is a root of the equation x^2 + kx - 15 = 0, what is the value of k?
Test yourself: pick an answer
Reveal answer & explanation
Correct answer: B) -2
Explanation
Substitute x = 5 into the equation: (5)^2 + 5k - 15 = 0 -> 25 + 5k - 15 = 0 -> 10 + 5k = 0 -> 5k = -10 -> k = -2.
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