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class 9 worksheets -cbse

CBSE Worksheets for Class 9 | Download 9th Grade Worksheets for All Subjects. 9th class is very important from the board’s point of view. Because without scoring in 9th you cannot appear for the 10th standard board exams. You will have a lot of basics to learn in class 9 for further studies.

video on Surface areas      https://youtu.be/r7aznVoFUcA

Algebraic formulae

  1. (a + b)2 = a2 + b2 + 2ab

  2. (a - b)2 = a2 + b2 - 2ab

  3. (a + b)3 = a3 + b3 +3a2b + 3ab2   or a3 +  b3+-3ab (a + b)

  4. (a - b)3 = a3 - b3 -3a2b + 3ab2   or  a3 - b3 -3ab (a – b)

  5. (a - b)2    =  (a + b)2  = 2a2 + 2b2

  6. (a + b)2   =   (a - b)2   = 4ab

  7. If a+b+c =0 then  a3 + b3+ c3 = 3abc

  8. (a+b) (a-b) = a2  - b2

  9. (a +b +c)2 = a2 + b2+ c2 +2ab +2bc +2ca

  10. a3 + b3+ c3 -3abc = (a +b +c) (a2 + b2+ c2 -ab-bc-ca)

  11. (x + a) ( x + b) = x2 + ( a + b)x +ab

  12. a2 + b2 = (a + b)2 – 2ab  or a2 + b2 = (a - b)2 + 2ab 

  13. a3 – b 3  = (a - b) (a2 +  ab + b2)

  14. a3 + b 3  = (a + b) (a2 -  ab + b2)

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