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 }