Verified answer

4-x= √(x+2)

(4-x)² = x + 2

x² - 8x +16 = x + 2

x² - 9x + 14 = 0

x = [-b ± √(b² - 4ac)]/2a

x = [-(-9) ± √((-9)² - 4(1)14)]/2(1)

x = [9 ± √(81 - 56)]/2

x = [9 ± √25]/2

x = [9 ± 5]/2

x' = [9+5]/2

x' = 14/2

x' = 7

x'' = [9-5]/2

x'' = 4/2

x'' = 2

4-x= √(x+2)

4 - 7 = √(7+2)

4 - 7 = √9

-3 = 3 Falso

4-2= √(2+2)

4-2 = √4

2 = 2 Verdadeiro

S = {2}

4-x= raiz de x+2

(4-x)² = x+2

16 - 8x + x² = x + 2

x² -9x + 14 = 0

x' = 7

x" = 2

QSL?

e igual a 2/3