26. If the roots of the equations ax² + 2bx + c = 0 and bx² – 2√ac x + b = 0 are simultaneously real, then (a) b = ac (b) b2 = ac (c) a2 = be (d) c2 = ab

Answer: b Explaination:Reason: Given equations have real roots, then D1 ≥ 0 and D2 ≥ 0 (2b)² – 4ac > 0 and (-2√ac)² – 4b.b ≥ 0 4b² – 4ac ≥ 0 and 4ac – 4b2 > 0 b² ≥ ac and ac ≥ b² ⇒ b² = ac