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Factorise: 15a3b – 35ab3

Answer»

15a3b – 35ab3

= 3 × 5 × a × a × a × b – 7 × 5 × a × b × b × b 

= 5 × a × b [3 × a × a – 7 × b × b] 

= 5ab [3a2 – 7b2]



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