Let a,b,c be real. If ax2+bx+c=0 has two real roots α and β such that α<−1 and β>1, then 1+ca+ba, is
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a
<0
b
>0
c
≤0
d
none of these
answer is A.
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Detailed Solution
Let f(x)=ax2+bx+c. Clearly, -1 and 1 lie between the roots of f(x)=0.∴ af(1)<0 and af(−1)<0⇒ a(a+b+c)<0 and a(a−b+c)<0⇒a21+ba+ca<0 and a21−ba+ca<0⇒ 1+ba+ca<0 and 1−ba+ca<0⇒1+ba+ca<0