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b.
silahkan lihat caranya dibawah
b. 3x² + [2(3x)(2y)] + 2y² - 2x² + [2(2x)(-5y)] + (-5y)²
= 9x² + 12xy + 4y² - 4x² - 20xy +25y²
= 5x² - 8xy +29y²