Question

Dau 30 de puncte!!!!
$x^{2} + 9+ 2x= x^{2} +16+5$

Answer 1

$x^{2}$ + 9 + 2x = $x^{2}$ + 21
$x^{2}$ + 2x + $x^{2}$ = 9+16+5
$4x^{4}$ = 30
$x^{4}$ = 30 : 4
$x^{4}$ = 7,5
x = 7,5 : 4 
x = 1,8
nu cred ca e bine,dar totusi te-am ajutat

Answer 2

x²+9+2x=x²+16+5⇒
x²-x²+2x=21-9⇒
2x=12⇒
x=12/2⇒
x=6
sucees