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6x³ - 3x² + 10x - 5 = 3x²(2x -1) + 5(2x - 1) = (3x² + 5)(2x - 1)
b)
x⁴ - 64 = (x² + 8)(x² - 8) = (x² + 8)((x + 2√2)(x - 2√2)
√8 = √(4*2) = 2√2
c)
25x² - 20x + 4 = (5x - 2)² = (5x - 2)(5x - 2)