0.25x^2+1.3x-2=0

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Solution for 0.25x^2+1.3x-2=0 equation:


Simplifying
0.25x2 + 1.3x + -2 = 0

Reorder the terms:
-2 + 1.3x + 0.25x2 = 0

Solving
-2 + 1.3x + 0.25x2 = 0

Solving for variable 'x'.

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

Divide each side by '0.25'.
-8 + 5.2x + x2 = 0

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + 5.2x + 8 + x2 = 0 + 8

Reorder the terms:
-8 + 8 + 5.2x + x2 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + 5.2x + x2 = 0 + 8
5.2x + x2 = 0 + 8

Combine like terms: 0 + 8 = 8
5.2x + x2 = 8

The x term is 5.2x.  Take half its coefficient (2.6).
Square it (6.76) and add it to both sides.

Add '6.76' to each side of the equation.
5.2x + 6.76 + x2 = 8 + 6.76

Reorder the terms:
6.76 + 5.2x + x2 = 8 + 6.76

Combine like terms: 8 + 6.76 = 14.76
6.76 + 5.2x + x2 = 14.76

Factor a perfect square on the left side:
(x + 2.6)(x + 2.6) = 14.76

Calculate the square root of the right side: 3.841874542

Break this problem into two subproblems by setting 
(x + 2.6) equal to 3.841874542 and -3.841874542.

Subproblem 1

x + 2.6 = 3.841874542 Simplifying x + 2.6 = 3.841874542 Reorder the terms: 2.6 + x = 3.841874542 Solving 2.6 + x = 3.841874542 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.6' to each side of the equation. 2.6 + -2.6 + x = 3.841874542 + -2.6 Combine like terms: 2.6 + -2.6 = 0.0 0.0 + x = 3.841874542 + -2.6 x = 3.841874542 + -2.6 Combine like terms: 3.841874542 + -2.6 = 1.241874542 x = 1.241874542 Simplifying x = 1.241874542

Subproblem 2

x + 2.6 = -3.841874542 Simplifying x + 2.6 = -3.841874542 Reorder the terms: 2.6 + x = -3.841874542 Solving 2.6 + x = -3.841874542 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.6' to each side of the equation. 2.6 + -2.6 + x = -3.841874542 + -2.6 Combine like terms: 2.6 + -2.6 = 0.0 0.0 + x = -3.841874542 + -2.6 x = -3.841874542 + -2.6 Combine like terms: -3.841874542 + -2.6 = -6.441874542 x = -6.441874542 Simplifying x = -6.441874542

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.241874542, -6.441874542}

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