Nomor 2 a-c pakai cara yah
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a.3(2x-1)² - 4(x+3)² = 3(2²x²-1²) – 4(x²+3²)
=3(4x²+1) – 4(x²+9)
=12x² + 3 – 4x² - 28
=8x²-25
c.(4x-3y)² - 4(5x+5y)² =(16x² + 9y²) - 4(25x² + 25y²)
=16x² + 9y² - 100x² - 100y²
= (- 84x²) (-81y²)