# Class 9th maths science group Chapter 4 Exercise 4.2

## Class 9th maths science group Chapter 4 Exercise 4.2

Class 9th maths science group Chapter 4 Exercise 4.210/26/2017 05:34:35 pm - notes - 9th - Mathematics Science Group - administrator
This series of lecture is about class 9th maths book exercise 4.2. You will get the lectures and notes about all the exercises of maths 9th, 10th, 11th, 12th. These lectures are related to Punjab Textbook Board PTB, Federal Board, Rawalpindi Board and all other educational boards of Punjab. 
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This Lecture includes complete notes of Exercise 4.2 Algebraic Expressions and Algebraic Formulas from class 9th maths (science group) Punjab Text Book Board. For FBISE, RWPBISE and all other boards like Lahore Board, Sargodha Board etc.
In this Lecture you will go through following Topics:
1. Algebraic Formulae
a) Using the Formulae
i) (a+b)2 + (a-b)2 = 2(a2 + b2) and (a+b)2 - (a-b)2 = 4ab
ii) (a + b + c)2 = a2 b2 c2 + 2ab + 2bc + 2ca
iii) (a + b)3 = a3 + 3ab(a + b) + b3
(a - b)3 = a3 - 3ab(a - b) - b3
iv) a3 + b3 = (a + b)(a2 - ab + b2)
a3 - b3 = (a - b)(a2 + ab + b2)

Select a question from the list bellow to see the video of that Question directly (works best in Google Chrome Browser):
Q. 1:	(i) If a + b = 10 and a - b = 6, then find the value of (a2 + b2).
Q. 1:	(ii) If a + b = 5 and a - b = √ 17 , then find the value of ab.
Q. 2:	a2+b2+c2=45 and a+b+c=-1, then find the value of ab+bc+ca.
Q. 3:	m+n+p=10 and mn+np+mp=27, then find the value of m2+n2+p2.
Q. 4:	x2+y2+z2=78 and xy+yz+zx=59, then find the value of x+y+z.
Q. 5:	x+y+z=12 and x2+y2+z2=64, then find the value of xy+yz+zx.
Q. 6:	if x+y=7 and xy=12, then find the value of x3+y3.
Q. 7:	if 3x+4y=11 and xy=12, then find the value of 27x3+64y3.
Q. 8:	if x-y=4 and xy=21, then find the value of x3-y3.
Q. 9:	if 5x-6y=13 and xy=6, then find the value of 125x3-216y3.
Q. 10:	if x+1/x=13, then find the value of x3+1/x3 .
Q. 11:	if x-1/x=7, then find the value of x3-1/x3 .
Q. 12:	if 3x+1/3x=5, then find the value of 27x3+1/27x3 .
Q. 13:	if 5x-1/5x=6, then find the value of 125x3-1/125x3.
Q. 14:	Factorize (i)	x3-y3-x+y	(ii) 8x3-1/27x3
Q. 15:	Find the products using formulas.

Class 9th maths science group Chapter 4 Exercise 4.2 All exercises Full Solutions
Class 9th maths science group Chapter 4 Exercise 4.2 Notes
Class 9th maths science group Chapter 4 Exercise 4.2 Video lecture
Class 9th maths science group Chapter 4 Exercise 4.2 All Questions pdf Notes


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