hi can someone show me the formula for these please- $\displaystyle (a - b)^3$ and $\displaystyle (a + b)^3$ thanks
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Hi, $\displaystyle (a-b)^3 = a^3-3a^2b+3ab^2-b^3$ $\displaystyle (a+b)^3 = a^3+3a^2b+3ab^2+b^3$
hi for the second one u can use : $\displaystyle (a+b)^n=\sum_{k=0}^{n}\begin{pmatrix} n\\ k \end{pmatrix}a^{n-k}b^{k}$ ( Binomial theorem )
could anyone also tell me the formula for: $\displaystyle (a + b)^4$ and $\displaystyle (a - b)^4$? thankyou
Originally Posted by mark could anyone also tell me the formula for: $\displaystyle (a + b)^4$ and $\displaystyle (a - b)^4$? thankyou The Binomial Theorem: Formulas
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