1.21x^2+2.64x+1.44=0

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Solution for 1.21x^2+2.64x+1.44=0 equation:


Simplifying
1.21x2 + 2.64x + 1.44 = 0

Reorder the terms:
1.44 + 2.64x + 1.21x2 = 0

Solving
1.44 + 2.64x + 1.21x2 = 0

Solving for variable 'x'.

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

Divide each side by '1.21'.
1.190082645 + 2.181818182x + x2 = 0

Move the constant term to the right:

Add '-1.190082645' to each side of the equation.
1.190082645 + 2.181818182x + -1.190082645 + x2 = 0 + -1.190082645

Reorder the terms:
1.190082645 + -1.190082645 + 2.181818182x + x2 = 0 + -1.190082645

Combine like terms: 1.190082645 + -1.190082645 = 0.000000000
0.000000000 + 2.181818182x + x2 = 0 + -1.190082645
2.181818182x + x2 = 0 + -1.190082645

Combine like terms: 0 + -1.190082645 = -1.190082645
2.181818182x + x2 = -1.190082645

The x term is 2.181818182x.  Take half its coefficient (1.090909091).
Square it (1.190082645) and add it to both sides.

Add '1.190082645' to each side of the equation.
2.181818182x + 1.190082645 + x2 = -1.190082645 + 1.190082645

Reorder the terms:
1.190082645 + 2.181818182x + x2 = -1.190082645 + 1.190082645

Combine like terms: -1.190082645 + 1.190082645 = 0.000000000
1.190082645 + 2.181818182x + x2 = 0.000000000

Factor a perfect square on the left side:
(x + 1.090909091)(x + 1.090909091) = 0.000000000

Calculate the square root of the right side: 0.000000000

Break this problem into two subproblems by setting 
(x + 1.090909091) equal to 0.000000000 and 0.000000000.

Subproblem 1

x + 1.090909091 = 0.000000000 Simplifying x + 1.090909091 = 0.000000000 Reorder the terms: 1.090909091 + x = 0.000000000 Solving 1.090909091 + x = 0.000000000 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.090909091' to each side of the equation. 1.090909091 + -1.090909091 + x = 0.000000000 + -1.090909091 Combine like terms: 1.090909091 + -1.090909091 = 0.000000000 0.000000000 + x = 0.000000000 + -1.090909091 x = 0.000000000 + -1.090909091 Combine like terms: 0.000000000 + -1.090909091 = -1.090909091 x = -1.090909091 Simplifying x = -1.090909091

Subproblem 2

x + 1.090909091 = 0.000000000 Simplifying x + 1.090909091 = 0.000000000 Reorder the terms: 1.090909091 + x = 0.000000000 Solving 1.090909091 + x = 0.000000000 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.090909091' to each side of the equation. 1.090909091 + -1.090909091 + x = 0.000000000 + -1.090909091 Combine like terms: 1.090909091 + -1.090909091 = 0.000000000 0.000000000 + x = 0.000000000 + -1.090909091 x = 0.000000000 + -1.090909091 Combine like terms: 0.000000000 + -1.090909091 = -1.090909091 x = -1.090909091 Simplifying x = -1.090909091

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-1.090909091, -1.090909091}

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