Question

$4x^{2} =2x^{2} +240$

Answer 1

Resposta:

S = {-2√30, 2√30}

Explicação passo a passo:

$4x^{2} =2x^{2} +240\\\\ 4x^{2} -2x^{2} =240\\\\2x^{2} =240\\\\x^{2} =\frac{240}{2} \\\\x^{2} =120\\\\x=\pm\sqrt{120} \\\\ x= \pm\sqrt{4\times30} \\\\ x= \pm\sqrt{4} \sqrt{30} \\\\\bold{x=\pm 2\sqrt{30} }$