Mathematics for IGCSE & O level - Equations (Section 6 - No. 43)

What must be done to the equation x² + 8x + 7 = 0 before completing the square?

Move the constant term to the right side of the equation.

Divide both sides by the coefficient of x² (if it isn't 1).

Isolate the x² and x terms on one side.

Factor out the variable x.

These steps prepares to add and subtract to complete the square.