9x^2+10x+12+9x^2-21x-4=0

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Solution for 9x^2+10x+12+9x^2-21x-4=0 equation: 


Simplifying
9x2 + 10x + 12 + 9x2 + -21x + -4 = 0

Reorder the terms:
12 + -4 + 10x + -21x + 9x2 + 9x2 = 0

Combine like terms: 12 + -4 = 8
8 + 10x + -21x + 9x2 + 9x2 = 0

Combine like terms: 10x + -21x = -11x
8 + -11x + 9x2 + 9x2 = 0

Combine like terms: 9x2 + 9x2 = 18x2
8 + -11x + 18x2 = 0

Solving
8 + -11x + 18x2 = 0

Solving for variable 'x'.

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

Divide each side by '18'.
0.4444444444 + -0.6111111111x + x2 = 0

Move the constant term to the right:

Add '-0.4444444444' to each side of the equation.
0.4444444444 + -0.6111111111x + -0.4444444444 + x2 = 0 + -0.4444444444

Reorder the terms:
0.4444444444 + -0.4444444444 + -0.6111111111x + x2 = 0 + -0.4444444444

Combine like terms: 0.4444444444 + -0.4444444444 = 0.0000000000
0.0000000000 + -0.6111111111x + x2 = 0 + -0.4444444444
-0.6111111111x + x2 = 0 + -0.4444444444

Combine like terms: 0 + -0.4444444444 = -0.4444444444
-0.6111111111x + x2 = -0.4444444444

The x term is -0.6111111111x.  Take half its coefficient (-0.3055555556).
Square it (0.09336419756) and add it to both sides.

Add '0.09336419756' to each side of the equation.
-0.6111111111x + 0.09336419756 + x2 = -0.4444444444 + 0.09336419756

Reorder the terms:
0.09336419756 + -0.6111111111x + x2 = -0.4444444444 + 0.09336419756

Combine like terms: -0.4444444444 + 0.09336419756 = -0.35108024684
0.09336419756 + -0.6111111111x + x2 = -0.35108024684

Factor a perfect square on the left side:
(x + -0.3055555556)(x + -0.3055555556) = -0.35108024684

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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