What number should be added to both sides of the equation to complete the square x^2 + 3x = 6

+

Step-by-step explanation:

To complete the square, with the coefficient of the x² term = 1

add ( half the coefficient of the x- term)² to both sides

x² + 3x + ()² = 6 + ()²

x² + 3x + = 6 +

6mm^3 or .6cm^3

      216

      /   \

  36     6

  /   \     /

6     6   6

factor trees are nice.