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Factor completely the given polynomials. 1. x4 – 25x2 + 144 2. X4 - x - 7x2 + x + 6 3. x4 + 2x3 - 9x2 - 2x + 8 4. x4 - 5x2 + 4 - 5. 2x3 + 3x28x - 12​