Question

me ajudem a resolver
|2x²+5|=55

Answer 1

|2x² + 5| = 55
2x² = 55 - 5 
2x² = 50
x² = 50 / 2
x² = 25

x = +/- $\sqrt{25}$

Portanto, x'= + 5 e x"= - 5

Answer 2

$[ 2x^{2}+5]=55 \\ 2x^{2} +5-55=0 \\ 2x^{2} -50 \\ 2x^{2} =50 \\ x^{2} = \frac{50}{2} \\ x^{2} =25 \\ x=+- \sqrt{25} \\ x=+-5 \\ S={-5,5}$