how to solve (4x +5)(4x +5) step by step URGENT 

(4x + 5)(4x + 5)
= (4x + 5)2  [Use identity (a+b)2 = a2 + 2ab + b2 ]
= (4x)2 + 2(4x)(5) + 52
= 16x2 + 40x + 25

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