Selina Concise Class 9 Maths Chapter 4 Expansions Exercise 4E Solutions EXERCISE – 4E (Q1) Simplify: (i) (x + 6) (x + 4) (x – 2) Solution: {(x + 6) (x + 4)} (x – 2) = {x (x + 4) + 6 (x + 4)} (x – 2) = {x2 + 4x + 6x […]
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Selina Concise Class 9 Maths Chapter 4 Expansions Exercise 4D Solutions
Selina Concise Class 9 Maths Chapter 4 Expansions Exercise 4D Solutions EXERCISE – 4D (Q1) If x + 2y + 3z = 0 and x3 + 4y3 + 9z3 = 18xyz evaluate: (x + 2y)2/xy + (2y + 3z)2/yz + (3z + x)2/2x Solution: Given that, x + 2y + 3z = 0 and […]
Selina Concise Class 9 Maths Chapter 4 Expansions 4C Solutions
Selina Concise Class 9 Maths Chapter 4 Expansions Exercise 4C Solutions Exercise – 4C (1) Expand (i) (x + 8) (x + 10) => Solution:- given that, (x + 8) (x + 10) = x × (x + 10) + 8 × (x + 10) = x2 + 10x + 8x + 80 […]
Selina Concise Class 9 Maths Chapter 4 Expansions 4B Solutions
Selina Concise Class 9 Maths Chapter 4 Expansions Exercise 4B Solutions Exercise 4B (1) Find the cube of (i) 3a – 7b => Solution:- We have to cube of (3a – 7b) Now, we have to use formula (a+ b)3 = a3 + 3ab (a+ b) + b3 and also, we have to […]
Selina Concise Class 9 Maths Chapter 4 Expansions 4A Solutions
Selina Concise Class 9 Maths Chapter 4 Expansions Exercise 4A Solutions EXERCISE – 4A (1) Find the square of (i) 2a + b = Solution: We have to square of (2a + b) Now, we have to use formula (a + b)2 = a2 + 2ab + b2 a = 2a and b […]