Question

Solve each equation by square roots.3r^2+4=247

Answer 1

Step-by-step explanation:

$= > 3 {r}^{2} + 4 = 247 \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ = > 3 \: {r}^{2} = 247 - 4 = 243 \\ = > {r}^{2} = \frac{243}{3} = 81 \: \: \: \: \: \: \: \: \: \: \: \: \: \\ = > r = \sqrt{81} = 9 \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \:$

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