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 […]

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## 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 […]

## Selina Concise Class 10 Math Chapter 14 Equation of a line Exercise 14E Solutions

Selina Concise Class 10 Math Chapter 14 Equation of a line Exercise 14E Solutions Exercise 14E (Q1) Find the value of K for which the lines kx – 5y + 4 = 0 and 5x -2y + 5 = 0 are perpendicular to each other. Solution: Given equation of – Lines are kx […]

## Selina Concise Class 10 Math Chapter 14 Equation of a line Exercise 14D Solutions

Selina Concise Class 10 Math Chapter 14 Equation of a line Exercise 14D Solutions Exercise 14D (Q1) Find the slope and y – intercept of the line: (i) y = 4 (ii) ax – by = 0 (iii) 3x – 4y = 5 Solution: (i) Y = 4 General equation, y = mx […]

## Selina Concise Class 10 Math Chapter 14 Equation of a line Exercise 14C Solutions

Selina Concise Class 10 Math Chapter 14 Equation of a line Exercise 14C Solutions Exercise- 14C (1) Find the equation of line whose y – intercept = 2 and slope = 3 Solution: Given that, y – Intercept = 2 x = 0 Slope = 3 m = 3 ∴ We have to […]

## Selina Concise Class 10 Math Chapter 14 Equation of a line Exercise 14B Solutions

Selina Concise Class 10 Math Chapter 14 Equation of a line Exercise 14B Solutions Exercise – 14B (1) Find the slope of the line whose inclination is: (i) 0° (ii) 30° (iii) 72° (iv) 46° Solution:- (i) Θ = 0° Slope of x – axis parallel to x – axis ∴ m […]

## Selina Concise Class 10 Math Chapter 6 Solving (simple) problems (Based on Quadratic Equations) Exercise 6D Solutions

Selina Concise Class 10 Math Chapter 6 Solving (simple) problems (Based on Quadratic Equations) Exercise 6D Solutions Solving (simple) problems (Based on Quadratic Equations) Exercise 6D (Q1) The sum S of n successive odd numbers starting from 3 is given by the relation: S = n (n + 2). Determine n, if the […]

## Selina Concise Class 10 Math Chapter 6 Solving (simple) problems (Based on Quadratic Equations) Exercise 6C Solutions

Selina Concise Class 10 Math Chapter 6 Solving (simple) problems (Based on Quadratic Equations) Exercise 6C Solutions Solving (simple) problems (Based on Quadratic Equations) Exercise 6C (Q1) The speed of an ordinary train is x km per hr and that of an express train is (x + 25) km per hr. (i) Find […]

## Selina Concise Class 10 Math Chapter 25 Exercise 25C Probability Solutions

Selina Concise Class 10 Math Chapter 25 Exercise 25C Probability Solutions Probability Exercise: 25C (Q1) A bag contains 3 red balls, 4 blue balls, and 1 yellow ball, all the balls being identical in shape and size. If a ball is taken out of the bag without looking into it; find the probability that […]