Question

Solve x2 + 4x = 4 for x by completing the square. x = −4 x = 0 x equals plus or minus 2 times the square root of 2 plus 2 x equals plus or minus 2 times the square root of 2 minus 2

Answer 1

±2
`√(2)` - 2

Explanation:

x² + 4x + 4 = 4 + 4

(x+2)² = 8

x+2 =
`√(8)`;
`√(8)` = 2
`√(2)`

x = ±2
`√(2)` - 2