First step to completing the square is to transpose the constant to the right-hand side of the equation. x² + 18x = -93
Then, the complete square should take the form, x² + 18x + ____ = -93 + ___
To determine the number that should be written in the blanks, divide the numerical coefficient of the second term and square the quotient. ___ = (18/2)^2 = 91