14.
The smallest value of k for which equation x² + kx + y = 0 has real root is?
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Given equation,
x² + kx + 16 = 0
According to,
D = B² - 4AC
k² - 4 × 1 × 16
k² = 64
If D > 0 , it will have real roots.
D > 0 => K² - 64 > 0
k² > 64
k > +8 or -8 !!
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