Question

Make r the subject of t ＝6r^2 + 12t
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Answer 1

`\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)}`