Expansion Selina Concise Maths Quiz (Cl-9)

Find the square of: (i) 2a + b

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Use identities to evaluate: (i) (101)^2

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Evalute: (i) (7x/8 + 4y/5)^2

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Evaluate: (i) (a/2b + 2b/a)^2 - (a/2b - 2b/a)^2 - 4

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If a + b = 7 and ab = 10; find a - b.

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If a - b = 7 and ab = 18; find a + b.

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If x + y = 7/2 and xy = 5/2; find: (i) x - y

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If a - b = 0.9 and ab = 0.36; find: (i) a + b

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If a - b = 4 and a + b = 6; find (i) a^2 + b^2

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If a^2 - 5a - 1 = 0 and a ≠ 0; find:

• A) a - 1/a

• B) a + 1/a

• C) a^2 - 1/a^2