ax²+bx+c=0; where a, b, c are real numbers. What is the value of b in equation x²-x-2=0?
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Answer:
Given equation ax
2
+bx+c=0
Determinant of equation should be positive for its roots to be real i.e, b
2
−4ac>0 but from the options we can see that only option D is right.
Because it reduces determinant to b
2
which is always positive.
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