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b) 5x² + 24X - 5
c) - 4X² + 28X - 49 atau 4X² - 28X + 49
b) (x+5)(5x-1)=5x²-x+25x-5
=5x²+24x-5
c) (7-2x)(2x-7)=14x-49-4x²+14x
=4x²+14x+14x-49
=-4x²+28x-49