1.

Find the product: (a – b) (2a + 4b)

Answer»

(a – b) (2a + 4b) 

= a(2a + 4b) – b(2a + 4b)

= (a × 2a + a × 4b) – (b × 2a + b × 4b)

= 2a2 + 4ab – (2ab + 4b2)

= 2a2 + 4ab – 2ab – 4b2

= 2a2 + 2ab – 4b2



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