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Rs aggarwal solutions
Grade 9 
Mathematics
Secondary school Mathematics class 9 Rs Aggarwal
Factorization of Polynomials
Factorization of Polynomials Exercise 3B
Question 21
Mathematics
Secondary school Mathematics class 9 Rs Aggarwal
Factorization of Polynomials
Factorization of Polynomials Exercise 3B
Question 21
Factorization of Polynomials | Factorization of Polynomials Exercise 3B
Question 21
CHAPTERS
3. Factorization of Polynomials
4. Linear Equations In Two Variables
6. Introduction To Euclids Geometry
9. Congruence Of Triangles And Inequalities In A Triangle
11. Areas Of Parallelograms And Triangles
14. Areas Of Triangles And Quadrilaterals
15. Volume And Surface Area Of Solids
Question 21
𝑥^2 + 𝑦^2 − 𝑧^2 − 2𝑥𝑦
𝑥^2 + 𝑦^2 − 𝑧^2 − 2𝑥𝑦
We can write it as
= (𝑥^2 + 𝑦^2 − 2𝑥𝑦) − 𝑧^2
So we get
= (𝑥 − 𝑦)^2 − 𝑧^2
Based on the equation 𝑎^2 − 𝑏^2 = (𝑎 + 𝑏)(𝑎 − 𝑏)
We get,
= (x – y + z) (x – y – z)
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