Question

sqrt(x + 2) = 4 - x o sqrt e significa a rais

Answer 1

Resposta:x=1


Explicação passo a passo:
(x+2)=4-x
x+x=4-2
2x=2
x=2/2
x=1

Answer 2

[\/(x + 2)]^2 = (4 - x)^2
x+2 = (4-x).(4-x)
x+2= 16 - 4x - 4x + x^2
x+2 = 16 - 8x + x^2
- x^2 + 8x - 16 + x + 2 = 0
- x^2 + 9x - 14 = 0 (-1)
x^2 - 9x + 14 = 0
a = 1; b= - 9; c = 14
/\= b^2 - 4ac
/\ = (-9)^2 - 4.1.14
/\= 81 - 56
/\ = 25
X = [-(-9)+/- \/25] / 2.1
x = (9 +/- 5)/2
x ' = (9+5)/2= 14/2= 7
X" = (9-5)/2= 4/2= 2

\/(x + 2)] = (4 - x)
\/(7+2) = (4-7)
+/- \/9 = -3
-3= -3

\/(2+2)= (4-2)
\/4= 2
2 = 2

R.:
S= {2,7}