Question

(x + b) 2 - x(x + 2b) = xb

Answer 1

$(x \: + \: b) ^{2} \: - \: x(x \: + \: 2b) \: = xb$

${b}^{2} \: = \: r \: \times \: cos( \theta) \: \times \: b \:$

$r \: \times \: cos( \theta) \: \times \: b \: = \: {b}^{2}$

$\boxed{ \bold{r \: = \: \frac{b}{cos(\theta)} }}$

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