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 5 Factorisation Exercise 5C Solutions

Selina Concise Class 9 Maths Chapter 5 Factorisation Exercise 5C Solutions EXERCISE – 5C (1) Factorize: 25a2 – 9b2 Solution: 25a2 – 9b2 We have to use, (a2 – b2) = (a + b) (a – b) => (5a)2 – (3b)2 {we have to convert given education in a2 – b2} => (5a + 3b) […]

## Selina Concise Class 9 Maths Chapter 5 Factorisation Exercise 5B Solutions

Selina Concise Class 9 Maths Chapter 5 Factorisation Exercise 5B Solutions EXERCISE – 5B (1) Factorize: a2 + 10a + 24 Solution: a2 + 10a + 24 => a2 + 6a + 4a + 24 => a (a + 6) + 4 (a + 6) => (a + 6) (a + 4) (2) […]

## Selina Concise Class 9 Maths Chapter 5 Factorisation Exercise 5A Solutions

Selina Concise Class 9 Maths Chapter 5 Factorisation Exercise 5A Solutions EXERCISE – 5A (Q1) Factorise by taking out the common factors. (1) 2 (2x – 5y) (3x + 4y) – 6 (2x – 5y) (x – y) Solution: 2 (2x – 5y) (3x + 4y) – 6 (2x – 5y) (x – y) […]

## Selina Concise Class 9 Maths Chapter 7 Indices Exercise 7B Solutions

Selina Concise Class 9 Maths Chapter 7 Indices Exercise 7B Solutions EXERCISE – 7B (i) 22x+1 = 8 Solution: 22x+1 = 8 => 22x+1 = 23 => 2x + 1 = 3 => 2x = 3 – 1 => 2x = 2 => x = 2/2 => x = 1 (ii) 25x-1 = […]

## Selina Concise Class 9 Maths Chapter 7 Indices Exercise 7A Solutions

Selina Concise Class 9 Maths Chapter 7 Indices Exercise 7A Solutions EXERCISE – 7A Selina Concise Class 9 Maths (1) Evaluate: (i) 33 × (243)-213 × 9-113 Solution: (3)3 × (3×3×3×3×3)-2/3 × (3×3)-1/3 = (3)3 × (35)-2/3 × (32)-1/3 = (3)3 × (3)-10/3 × (3)-2/3 = (3)3+(-10/3)+(-2/3) = (3)3-10/3-2/3 = (3)9-10-2/3 = (3)9-12/3 […]

## 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 […]