Question

me ajudem por favor

Answer 1

$Resolu\c{c}\~ao\ (a)\to \left\{\begin{array}{ccc} (hipotenusa)^2=(cateto)^2+(cateto)^2\\\\ 15^2 = x^2+12^2\\\\15^2 - 12^2 = x^2\\\\225-144 = x^2\\\\81 = x^2\\\\\boxed{x = \sqrt{81} = 9 }\end{array}\right$

$Resolu\c{c}\~ao\ (b)\to \left\{\begin{array}{ccc} (hipotenusa)^2=(cateto)^2+(cateto)^2\\\\ 10^2 = x^2+x^2\\\\10^2 = 2x^2\\\\ \frac{100}{2} = x^2 \\\\50 = x^2\\\\\boxed{x = \sqrt{50} = \sqrt{25*2} = 2 \sqrt{5} }\end{array}\right$

Espero ter ajudado. :))