9X-2X^2-18=0

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Solution for 9X-2X^2-18=0 equation:


Simplifying
9X + -2X2 + -18 = 0

Reorder the terms:
-18 + 9X + -2X2 = 0

Solving
-18 + 9X + -2X2 = 0

Solving for variable 'X'.

Begin completing the square.  Divide all terms by
-2 the coefficient of the squared term: 

Divide each side by '-2'.
9 + -4.5X + X2 = 0

Move the constant term to the right:

Add '-9' to each side of the equation.
9 + -4.5X + -9 + X2 = 0 + -9

Reorder the terms:
9 + -9 + -4.5X + X2 = 0 + -9

Combine like terms: 9 + -9 = 0
0 + -4.5X + X2 = 0 + -9
-4.5X + X2 = 0 + -9

Combine like terms: 0 + -9 = -9
-4.5X + X2 = -9

The X term is -4.5X.  Take half its coefficient (-2.25).
Square it (5.0625) and add it to both sides.

Add '5.0625' to each side of the equation.
-4.5X + 5.0625 + X2 = -9 + 5.0625

Reorder the terms:
5.0625 + -4.5X + X2 = -9 + 5.0625

Combine like terms: -9 + 5.0625 = -3.9375
5.0625 + -4.5X + X2 = -3.9375

Factor a perfect square on the left side:
(X + -2.25)(X + -2.25) = -3.9375

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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