Selina Concise Mathematics Class 9 ICSE Solutions Expansions (Including Substitution) Selina ICSE Solutions for Class 9 Maths Chapter 4 Expansions (Including Substitution) Exercise 4(A) 1. Find the square of: (i) 2a + b (ii) 3a + 7b (iii) 3a - 4b (iv) Solution 1: 2.Use identities to evaluate: (i) (101) 2 (ii) (502) 2 (iii) (97) 2 (iv) (998) 2 Solution 2: 3.Evalute: (i) (ii) Solution 3: 4.Evaluate: (i) ( ii) (4a +3b) 2 - (4a - 3b) 2 + 48ab. Solution 4: 5.If a + b = 7 and ab = 10; find a - b. Solution 5: 6.If a -b = 7 and ab = 18; find a + b. Solution 6: 7. If x + y = and xy = ; find: (i) x - y (ii) x 2 - y 2 Solution 7: 8.If a - b = 0.9 and ab = 0.36; find: (i) a + b (ii) a2 - b2. Solution 8: 9. If a - b = 4 and a + b = 6; find (i) a2 + b2 (ii) ab Solution 9: 10. If a + = 6 ans ...
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