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Question
If one zero of the quadratic polynomial x2 + 3x + k is 2, then the value of k is ______.
Options
10
- 10
5
- 5
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Solution
If one zero of the quadratic polynomial x² + 3x + k is 2, then the value of k is - 10.
Explanation:
Let f(x) = x2 + 3x + k
f(2) = (2)2 + 3(2) + k = 0
4 + 6 + k = 0
k = - 10
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