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sacamos la raiz a ambos terminos:
49x⁴-25
√49x⁴ = 7x² √25=5
entonces:
a²-b² = (a+b)(a-b)
(7x²)² - (5)² = (7x²+5)(7x²-5)
solucion:
49x⁴-25=(7x²+5)(7x²-5)