all formula mathematic class 9
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(a+b)^2 = a^2 + 2ab + b^2
(a-b)^2 = a^2 - 2ab + b^2
a^2 - b^2 = ( a+b ) ( a-b )
(a+b)^3 = a^3 + b^3 + 3ab(a-b)
and same for (a-b)^3-with opposite signs
(a-b)^2 = a^2 - 2ab + b^2
a^2 - b^2 = ( a+b ) ( a-b )
(a+b)^3 = a^3 + b^3 + 3ab(a-b)
and same for (a-b)^3-with opposite signs
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