Respuesta:
1. 12a⁴+ 51a²+ 45
2. 81a²-126x+49
3. 4x⁴-9
4. 12x²+7xy-10y²
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Verified answer
Respuesta:
1. 12a⁴+ 51a²+ 45
2. 81a²-126x+49
3. 4x⁴-9
4. 12x²+7xy-10y²