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प्रश्न
If `1/2` is a root of the equation `"x"^2 + "kx" - (5/4)` = 0 then the value of k is:
पर्याय
2
–2
3
–3
MCQ
उत्तर
2
Explanation:
As one root of the equation `"x"^2 + "kx" - (5/4)` = 0 is `1/2`
⇒ `(1/2)^2 + "k"(1/2) - 5/4` = 0
⇒ `1/4 + "k"/2 - 5/4` = 0
⇒ 1 + 2k – 5 = 0
⇒ 2k = 4
⇒ k = 2
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