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Make r the subject of t =6r^2 + 12t


User Zoecarver
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\sf \dashrightarrow t = 6r^2 + 12t


\sf \dashrightarrow -6r^2 = 12t-t


\sf \dashrightarrow -6r^2 = 11t


\sf \dashrightarrow 6r^2 = -11t


\sf \dashrightarrow r^2 = -(11t)/(6)


\sf \dashrightarrow r = \pm \sqrt{-(11t)/(6) }


\dashrightarrow \sf r=\pm i\sqrt{(11t)/(6)}

User Anastasia Pupynina
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