A fresh mrng guise ☺☺☺☺ tell me how this term -x square +60x – InterviewSolution

1.	A fresh mrng guise ☺☺☺☺ tell me how this term -x square +60x+2700=0 changes all sign¿¿¿¿¿explain in detail
Answer» x²-90x+30x-2700x(x-90)+30(x-90)(x-90)(x+30)x=90,-30it CHANGES SIGN because - sign has been TAKEN COMMON.

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