Question

O valor de x, abaixo:

Answer 1

$\Large\boxed{\begin{array}{l}\sf x^2=4^2+3^2-2\cdot4\cdot3\cdot cos(30^\circ)\\\sf x^2=16+9-\backslash\!\!\!2\cdot4\cdot3\cdot\dfrac{\sqrt{3}}{\backslash\!\!\!2}\\\sf x^2=25-12\sqrt{3}\\\sf x=\sqrt{25-12\sqrt{3}}\end{array}}$

$\Large\boxed{\begin{array}{l}\sf nota:caso~o~\hat angulo~entre~3~e~4~fosse~60^\circ~ter\acute iamos\\\sf x^2=4^2+3^2-2\cdot4\cdot3\cdot cos(60^\circ)\\\sf x^2=16+9-\backslash\!\!\!2\cdot4\cdot3\cdot\dfrac{1}{\backslash\!\!\!2}\\\sf x^2=25-12\\\sf x^2=13\\\sf x=\sqrt{13}\\\sf o~que~corresponderia~a~\acute ultima~alternativa\\\sf por~gentileza~verifique~se~o~gabarito\\\sf pertence~de~fato~a~este~enunciado.\end{array}}$