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=xpangkat2-2x+5
= x² + 2x - 5x + x + 4 + 1
= x² - 2x + 5
b. 8(2 - 5a²) - 7(3 - 4a²)
= 16 - 40a² - 21 + 28a²
= 16 - 21 - 40a² + 28a²
= - 5 - 12a²
sekian..