TAB2SUCCESS ACADEMY

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
-
(a + b)2 = a2 + b2 + 2ab
-
(a - b)2 = a2 + b2 - 2ab
-
(a + b)3 = a3 + b3 +3a2b + 3ab2 or a3 + b3+-3ab (a + b)
-
(a - b)3 = a3 - b3 -3a2b + 3ab2 or a3 - b3 -3ab (a – b)
-
(a - b)2 = (a + b)2 = 2a2 + 2b2
-
(a + b)2 = (a - b)2 = 4ab
-
If a+b+c =0 then a3 + b3+ c3 = 3abc
-
(a+b) (a-b) = a2 - b2
-
(a +b +c)2 = a2 + b2+ c2 +2ab +2bc +2ca
-
a3 + b3+ c3 -3abc = (a +b +c) (a2 + b2+ c2 -ab-bc-ca)
-
(x + a) ( x + b) = x2 + ( a + b)x +ab
-
a2 + b2 = (a + b)2 – 2ab or a2 + b2 = (a - b)2 + 2ab
-
a3 – b 3 = (a - b) (a2 + ab + b2)
-
a3 + b 3 = (a + b) (a2 - ab + b2)