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Me! 50 points! why does when we come home, our door is unlocked and there is grease on the door knob, me solve this , and i don't know what category this goes under

Solve each quadratic equation by factoring and using the zero product property. n^2 - 49 = 0

Find │7│. a. 1 over 7 b. –7 c. 7 asap i always mark brailiest who me so