Question

Determine x, sabendo que vale a formula: 15²=9²+x²

Answer 1

${15}^{2} = {9}^{2} + {x}^{2}$

$225 = 81 + {x}^{2}$

$225 - 81 = {x}^{2}$

$144 = {x}^{2}$

$x = \sqrt{144}$

$x = 12$