18-3(x+9)^2=0
Let's solve in ℝ: 18 -3·(x + 9)2 = 0
-3·(x + 9)2 = -18
(x + 9)2 = 6
x + 9 = -6
Solution found: x = -6 -9
x + 9 = 6
Solution found: x = 6 -9
▶Solution:   x = { -6 -9, 6 -9 }
The numeric value of: x = { -6 -9, 6 -9 } equals:
x = { ≈ -2.4495 -9, ≈ 2.4495 -9 }
▷ x = { ≈ -11.4495, ≈ -6.5505 }