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1) 7 (√(49x²+56x+7) + (7x+4)(98x+56)/[2√(49x² +56x+17)]
2) 9/√(7x+4) . 7/[2√(7x+4)] = 63([2(7x+4)]
3) )(98x+56)/[2√(49x² +56x+17)]
Debes hacer la sumatoria y tratar de simplificar
Saludos Herminio