1.

Find the square of:(i) \( (a+4 b) \)

Answer»
by using formula:(a+b)² = a² + b² + 2ab
we get:     a² + (4b)² + 2(a)(4b)
                =a² + 16b² + 8ab

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

=>  a+8ab + 16b  



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