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2015-07-06T11:54:22+08:00
The formula Cube of the FT + 3(Ft)squared(St) + 3(Ft)(St)squared Cube of the ST

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2015-07-06T13:03:23+08:00

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For cubing a binomial we need to know the formulas for the sum of cubes and the difference of cubes. 
Sum of cubes:
The sum of a cubed of two binomial is equal to the cube of the first term, plus three times the square of the first term by the second term, plus three times the first term by the square of the second term, plus the cube of the second term.(a + b)3 = a3 + 3a2b + 3ab2 + b3

            = a3 + 3ab (a + b) + b3

Difference of cubes:     The difference of a cubed of two binomial is equal to the cube of the first term, minus three times the square of the first term by the second term, plus three times the first term by the square of the second term, minus the cube of the second term.(a – b)3 = a3 – 3a2b + 3ab2 – b3

            = a3 – 3ab (a – b) – b3


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