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9-11 please? I understand the formulas I just don't understand how to solve... I get stuck

9-11 please? I understand the formulas I just don't understand how to solve... I get-example-1
User Vex
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u have to set all of the equation (9 thru 11) to zero. u got number nine right so far... for ten, u do the same thing, just subtract 25 from both sides den do that factoring thing
User Chrx
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