If f(x) is a quadratic expression such that f (1) + f (2) = 0, and $-$ 1 is a root of f (x) = 0, then the other root of f(x) = 0 is :

Question

$-$ ${5 \over 8}$

$-$ ${8 \over 5}$

${5 \over 8}$

${8 \over 5}$

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