-6
-4
4
5
Correct answer is B
Given x = (-1, 5) for the equation x2+kx−5=0
x=−1⟹x+1=0; x=5⟹x−5=0
(x+1)(x−5)=0, expanding,
x2−5x+x−5=0∴
\therefore k = -4.
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