Which of the following is a solution of x2 + 4x + 25?

Solve for x:

x^2 + 4 x + 25 = 0 I ssume that's the notation.

Subtract 25 from both sides:

x^2 + 4 x = - 25

Add 4 to both sides:

x^2 + 4 x + 4 = - 21

Write the left hand side as a square:

(x + 2) ^2 = - 21

Take the square root of both sides:

x + 2 = i sqrt (21) or x + 2 = - i sqrt (21)

Subtract 2 from both sides:

x = i sqrt (21) - 2 or x + 2 = - i sqrt (21)

Subtract 2 from both sides:

Answer: x = i sqrt (21) - 2 or x = - i sqrt (21) - 2