(ii) (2x - 2x + ax - a) : (x - a)
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Given 2x2 + ax - a2 = 0 ⇒ 2x2 + 2ax - ax - a2 = 0 ⇒ 2x(x + a) - a(x + a) = 0 ⇒(2x - a)(x + a) = 0 ∴x = a /2 or - a.
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