Question

solve for the equation (4+V15) +(4-V15)=8
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Answer 1

Answer:

$(4 + v15)(4 - v15) = 8 \\ \\ \\ = > you \: know....(x - y)(x + y) = {x}^{2} - {y}^{2} \\ \\ \\ = > 16 - 225 {v}^{2} = 8 \\ \\ \\ = > 225 {v}^{2} = 8 \\ \\ = > {v}^{2} = \frac{8}{225} \\ \\ = > v = \sqrt{ \frac{8}{225} } \\ \\ \\ \\ = > v = \frac{2 \sqrt{2} }{15}$

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