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x4 = x pangkat 4 , dan 16y4 itu 16 y pangkat 4
= (x²+ 2xy + 2xy + 4y²) (x² + 2xy + 2xy + 4y²)
=( x² + 4xy + 4y²) (x² + 4xy + 4y²)
= x⁴ + 4x³y² + 4x²y² + 4x³y + 4x²y² + 4xy³ + 4x²y² + 4xy³ + 4y⁴
= x⁴ + 4x³y² + 8x²y² + 4x³y + 8x²y² + 8xy³ + 4y⁴