need an equation distance=4800, speed=x-200, time=(x+2)

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1 Answer

Distance=speed*time, so 4800=(x-200)(x+2)=x^2-198x-400, x^2-198x-5200=0 (from which x=221.48 or -23.48). The requested equation is in bold print.

(CHECK: (221.48-200)(221.48+2)=4800; (-23.48-200)(-23.48+2)=4800.)

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