1.

guise please dont post irrelevant answer just tell me how this plus minus sign will changes¿¿¿¿¿ if it answers are irrelevant then it answer will be reported​

Answer»

Step-by-step explanation:they have take - as COMMON -( X^2 + 60x + 2700) = 0-x^2 - 60 x - 2700



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