1.9x^2+2.3x-1=2

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Solution for 1.9x^2+2.3x-1=2 equation:


Simplifying
1.9x2 + 2.3x + -1 = 2

Reorder the terms:
-1 + 2.3x + 1.9x2 = 2

Solving
-1 + 2.3x + 1.9x2 = 2

Solving for variable 'x'.

Reorder the terms:
-1 + -2 + 2.3x + 1.9x2 = 2 + -2

Combine like terms: -1 + -2 = -3
-3 + 2.3x + 1.9x2 = 2 + -2

Combine like terms: 2 + -2 = 0
-3 + 2.3x + 1.9x2 = 0

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

Divide each side by '1.9'.
-1.578947368 + 1.210526316x + x2 = 0

Move the constant term to the right:

Add '1.578947368' to each side of the equation.
-1.578947368 + 1.210526316x + 1.578947368 + x2 = 0 + 1.578947368

Reorder the terms:
-1.578947368 + 1.578947368 + 1.210526316x + x2 = 0 + 1.578947368

Combine like terms: -1.578947368 + 1.578947368 = 0.000000000
0.000000000 + 1.210526316x + x2 = 0 + 1.578947368
1.210526316x + x2 = 0 + 1.578947368

Combine like terms: 0 + 1.578947368 = 1.578947368
1.210526316x + x2 = 1.578947368

The x term is 1.210526316x.  Take half its coefficient (0.605263158).
Square it (0.3663434904) and add it to both sides.

Add '0.3663434904' to each side of the equation.
1.210526316x + 0.3663434904 + x2 = 1.578947368 + 0.3663434904

Reorder the terms:
0.3663434904 + 1.210526316x + x2 = 1.578947368 + 0.3663434904

Combine like terms: 1.578947368 + 0.3663434904 = 1.9452908584
0.3663434904 + 1.210526316x + x2 = 1.9452908584

Factor a perfect square on the left side:
(x + 0.605263158)(x + 0.605263158) = 1.9452908584

Calculate the square root of the right side: 1.394736842

Break this problem into two subproblems by setting 
(x + 0.605263158) equal to 1.394736842 and -1.394736842.

Subproblem 1

x + 0.605263158 = 1.394736842 Simplifying x + 0.605263158 = 1.394736842 Reorder the terms: 0.605263158 + x = 1.394736842 Solving 0.605263158 + x = 1.394736842 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.605263158' to each side of the equation. 0.605263158 + -0.605263158 + x = 1.394736842 + -0.605263158 Combine like terms: 0.605263158 + -0.605263158 = 0.000000000 0.000000000 + x = 1.394736842 + -0.605263158 x = 1.394736842 + -0.605263158 Combine like terms: 1.394736842 + -0.605263158 = 0.789473684 x = 0.789473684 Simplifying x = 0.789473684

Subproblem 2

x + 0.605263158 = -1.394736842 Simplifying x + 0.605263158 = -1.394736842 Reorder the terms: 0.605263158 + x = -1.394736842 Solving 0.605263158 + x = -1.394736842 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.605263158' to each side of the equation. 0.605263158 + -0.605263158 + x = -1.394736842 + -0.605263158 Combine like terms: 0.605263158 + -0.605263158 = 0.000000000 0.000000000 + x = -1.394736842 + -0.605263158 x = -1.394736842 + -0.605263158 Combine like terms: -1.394736842 + -0.605263158 = -2 x = -2 Simplifying x = -2

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.789473684, -2}

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