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= 5x²+24x-5
2.) (7-2x) (2x-7)= 14x-49-4x²+14x
= 28x-49-4x²
2).(7-2x)(2x-7)=7(2x-7)-2x(2x-7)=14x-49-4x²+14x=28x-4x²-49
koreksi lagi ya!!