if 1/2 is root of the equation x²+ky-5/4=0, then the value of k is
a)2
b)-2
c)1/4
d)1/2
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the given equation has real roots, a = 2 , b = k and c = 8. D = 0 b2 - 4ac = 0 k2 - 4 * 2 *8 = 0 k2 = 64 k = ± √64 ∴k = ± 8.
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