Question

determine as soluçoes das equaçoes a seguir .
a-) 2x²-128=0    , b-) 3x²-15=153

Answer 1

$a-)2 x^{2} -128=0\\2 x^{2} =128\\ x^{2} = \frac{128}{2} \\x= \sqrt{64}\\x=8$

$b-) 3 x^{2} -15=153\\3 x^{2} =153+15\\3 x^{2} =168\\ x^{2} = \frac{168}{3} \\ x^{2} =56\\x= \sqrt{56}$