Chap 5 Expansion (Q1a & Q2c)



a)(a+3)(a+5)=axa+ax5+3xa+3x5
                    =axa+ax5+3xa+15

b)(b+4)(b-1)=bsquare 2 +4b-4-b
                   =bsquare 2 +3b-4

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