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Verified answer
(x²-y)(x²+3y)x⁴+3x²y-x²y-3y²
=x⁴+2x²y-3y²
Kelas : VIII SMP
(x²-y) (x²+3y)
⇒ x⁴ + 3x²y - x²y - 3y²
⇒ x⁴ + 2x²y - 3y²