Question

$y2 - 15 iske$
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Answer 1

$\huge\boxed{\fcolorbox{black}{grey}{Hi dear!}}$

${y}^{2} - { \sqrt{15} }^{2} \\ (y + \sqrt{15} )(y - \sqrt{15} ) \\ y = - \sqrt{15} \\ y = \sqrt{15}$