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Q : 4         Simplify:

                 (i) (a^2-b^2)^2

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we use 
(a-b)^{2} = a^{2} - 2ab + b^{2}
 In this a = a^{2} and b = b^{2}
                            (a^{2}-b^{2})^{2} = (a^{2})^{2} - 2(a^{2})(b^{2}) + (b^{2})^{2}
                                                   =a^{4} - 2a^{2}b^{2} + b^{4}

Posted by

Gautam harsolia

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