Evalute
$x + a = 2 x^{2} - a^{2} = 1$
Find $x - a$

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Solution

$x + a = 2 \dots (1) x^{2} - a^{2} = 1 (x + a) (x - a) = 1 2 (x - a) = 1 x - a = \frac{1}{2}$

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