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# Class 9th maths science group Chapter 4 Exercise 4.2

Class 9th maths science group Chapter 4 Exercise 4.2

10/26/2017 05:34:35 pm - notes - 9th - Mathematics Science Group - administratorThis 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.

Contact +923445939990 to get complete DVDs of Notes and Video lectures of 9th Mathematics Science Group at your doorstep.

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(a^{2}+ b^{2}) and (a+b)^{2}- (a-b)^{2}= 4ab ii) (a + b + c)^{2}= a^{2}b^{2}c^{2}+ 2ab + 2bc + 2ca iii) (a + b)^{3}= a^{3}+ 3ab(a + b) + b^{3}(a - b)^{3}= a^{3}- 3ab(a - b) - b^{3}iv) a^{3}+ b^{3}= (a + b)(a^{2}- ab + b^{2}) a^{3}- b^{3}= (a - b)(a^{2}+ ab + b^{2})Cant see the pdf file? Click hereSelect 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 (a^{2}+ b^{2}). Q. 1: (ii) If a + b = 5 and a - b = √ 17 , then find the value of ab. Q. 2: a^{2}+b^{2}+c^{2}=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 m^{2}+n^{2}+p^{2}. Q. 4: x^{2}+y^{2}+z^{2}=78 and xy+yz+zx=59, then find the value of x+y+z. Q. 5: x+y+z=12 and x^{2}+y^{2}+z^{2}=64, then find the value of xy+yz+zx. Q. 6: if x+y=7 and xy=12, then find the value of x^{3}+y^{3}. Q. 7: if 3x+4y=11 and xy=12, then find the value of 27x^{3}+64y^{3}. Q. 8: if x-y=4 and xy=21, then find the value of x^{3}-y^{3}. Q. 9: if 5x-6y=13 and xy=6, then find the value of 125x^{3}-216y^{3}. Q. 10: if x+1/x=13, then find the value of x^{3}+1/x^{3}. Q. 11: if x-1/x=7, then find the value of x^{3}-1/x^{3}. Q. 12: if 3x+1/3x=5, then find the value of 27x^{3}+1/27x^{3}. Q. 13: if 5x-1/5x=6, then find the value of 125x^{3}-1/125x^{3}. Q. 14: Factorize (i) x^{3}-y^{3}-x+y (ii) 8x^{3}-1/27x^{3}Q. 15: Find the products using formulas.Problem loading Video or seeking questions? Try Alternate Links 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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10/26/2017 05:31:01 pm - notes - 9th - Mathematics Science Group - This series of lecture is about class 9th maths book exercise 4.1. 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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10/26/2017 05:37:12 pm - notes - 9th - Mathematics Science Group - This series of lecture is about class 9th maths book exercise 4.3. 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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