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Question
If x = 3 is a root of the quadratic equation x2 + mx – 9 = 0 then find the value of m.
Sum
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Solution
Given:
x2 + mx − 9 = 0
Substitute x = 3:
(3)2 + m(3) − 9 = 0
9 + 3m − 9 = 0
3m = 0
m = 0
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