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NOTE: xx can be written as x^2 i.e. x squared

3x^2 + 16x + 5

= 3 x^2 + x + 15x + 5 (Since 16x = x + 15x)

= x ( 3x + 1 ) + 5 ( 3x + 1 )

= ( x + 5 ) ( 3x + 1 )

Therefore the factors are ( x + 5 ) and ( 3x + 1 )

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