Question

Determinati solutiile ecuatiilor:
a) 2x (la puterea a doua) +5=7
b) 4x (la puterea a doua) -2=0

Answer 1

a) 2$x^{2}$+5=7
2$x^{2}$=7-5
2$x^{2}$=2
$x^{2}$=2/2
$x^{2}$=1

b) 4$x^{2}$-2=0
   4$x^{2}$=2
   $x^{2}$=4/2
   $x^{2}$=2

Answer 2

 2x^{2} +5=7 ; 2x^{2} =7-5 ; 2x^{2} =2 ; x^{2}= \frac{2}{2} ; x^{2} =1 ; x=1