Question

Make r the subject of the formula in ar² + b=c

Answer 1

$Given \: formula : ar^{2} + b = c$

$\implies ar^{2} = c - b$

$\implies r^{2} = \frac{(c - b)}{a}$

$\implies r = \pm \sqrt{\frac{(c - b)}{a}}\: \blue { r \: is \: subject )}$

Therefore.,

$\red{ r}\green { = \pm \sqrt{\frac{(c - b)}{a}}}\\ \blue { r \: is \: subject )}$

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