The number a is real and such that the equation x^2 +2 (a - 1) x - a + 7 = 0 has
two different real negative solutions. One can then conclude that
(a) a <−2; (b) 3 <a <7; (c) it is impossible; (d) none of (a) - (c).
Given equation-
Let the required roots be -m and -n
then sum of roots
Also Product of roots
As,
Also,
So
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