Respuesta :

iloveonedirection
7x²+9x⁴-3x²-x⁴-4x²
(7x²-3x²-4x²) + (9x⁴-x⁴)
(4x²-4x²) + (8x⁴)
(0) + (8x⁴)
8x⁴
Riya25
7x^2,(-3x^2),(-4x^2) are like terms
9x^4,(-x^4) are like terms

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