Question

$8 {x}^{2} - 25 = 103$
${x}^{2} + 8 = 72$
$3 {x}^{2} + 40 = 283$
por favor son para dentro de media hora
doy coronita y 15 puntos
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Answer 1

Respuesta:

$8x^{2} -25 = 103\\\\8x^{2} = 103+25\\\\8x^{2} = 128\\\\x^{2} =\frac{128}{8} \\\\ x^{2} =16\\\\\sqrt{x^{2} } =\sqrt{16} \\\\x= 4$

$x^{2} +8= -72\\\\x^{2} = -72-8\\\\x^{2} = -80 \\\\\sqrt{x^{2}} = \sqrt{-80} \\\\x= \sqrt{-80}$

$3x^{2} +40 = 283\\\\3x^{2} = 283 -40 \\\\3x^{2} = 243\\\\x^{2} = \frac{243}{3} \\\\x^{2} = 81\\\\\sqrt{x^{2} } = \sqrt{81} \\\\x= 9$