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a.
4x² + x - 3 = 12 - 2x²
4x² + 2x² + x - 3 - 12
6x² + x - 15 = 0
(3x + 5)(2x - 3) =0
x = -5/3 atau 3/2
b.
20 - x - x² = 8 + 3x
20 - 8 - x - 3x - x² = 0
12 - 4x - 3x² = 0
-3x² - 4x + 12 = 0
(jawabannya ada di foto)