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Mathematics 9 Online
OpenStudy (anonymous):

solve r^2=24-2r

OpenStudy (anonymous):

either; r=4 or, r=-6

OpenStudy (anonymous):

r^2+2r-24=0 r^2+6r-4r-24=0 r(r+6)-4(r+4)=0 (r-4)(r+6)=0 r=4 or r=-6

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