Question

ayudenme y te doy la mejor calificacion

Answer 1

Recuerda que:

${a}^{2} - {b}^{2} = (a + b)(a - b)$

...

$A = ( \sqrt{x + \sqrt{y} } )( \sqrt{x - \sqrt{y} } ( \sqrt{ {x}^{2} - y)} + y \\ A = ( \sqrt{(x + \sqrt{y})(x - \sqrt{y} )} ( \sqrt{ {x}^{2} - y } + y \\ A = (\sqrt{ {x}^{2} - y } )( \sqrt{ {x}^{2} - y)} + y \\ A = \sqrt{ {( {x}^{2} - y) }^{2} } + y \\ A = {x}^{2} - y + y \\ A = {x}^{2}$