Question

Find mean proportional
$\frac{x + y}{x - y} \frac{x^{2} - {y}^{2} }{ {x}^{2} - {y}^{2} }$
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Answer 1

Step-by-step explanation:

$let \: m \: = \frac{x + y}{x - y}\frac{ {x}^{2} - {y}^{2} }{ {x}^{2} - {y}^{2} } \\ {m}^{2} = \frac{x + y}{x - y} \times \frac{(x + y)(x - y)}{(x + y)(x - y)} \\ {m}^{2} = \frac{x + y}{x - y} \\ m = ( { \frac{x + y}{x - y} })^{2}$

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Answer 2

Metamorphic rocks arise from the transformation of existing rock to new types of rock, in a process called metamorphism. The original rock is subjected to temperatures greater than 150 to 200 °C and, often, elevated pressure of 100 megapascals or more, causing profound physical or chemical changes.