Q : 3        Simplify.

               (i) \small (x^2-5)(x+5)+25

Answers (1)

this can be simplified as follows

(x^{2} -5) X (x + 5) + 25  = (x^{2})(x) + (x^{2})(5) + (-5)(x) + (-5)(5)  + 25
                                    = x^{3} + 5x^{2} - 5x -25 + 25
                                     = x^{3} + 5x^{2} - 5x

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