2.9x^2+9.4x-5.2=0

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Solution for 2.9x^2+9.4x-5.2=0 equation:


Simplifying
2.9x2 + 9.4x + -5.2 = 0

Reorder the terms:
-5.2 + 9.4x + 2.9x2 = 0

Solving
-5.2 + 9.4x + 2.9x2 = 0

Solving for variable 'x'.

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

Divide each side by '2.9'.
-1.793103448 + 3.24137931x + x2 = 0

Move the constant term to the right:

Add '1.793103448' to each side of the equation.
-1.793103448 + 3.24137931x + 1.793103448 + x2 = 0 + 1.793103448

Reorder the terms:
-1.793103448 + 1.793103448 + 3.24137931x + x2 = 0 + 1.793103448

Combine like terms: -1.793103448 + 1.793103448 = 0.000000000
0.000000000 + 3.24137931x + x2 = 0 + 1.793103448
3.24137931x + x2 = 0 + 1.793103448

Combine like terms: 0 + 1.793103448 = 1.793103448
3.24137931x + x2 = 1.793103448

The x term is 3.24137931x.  Take half its coefficient (1.620689655).
Square it (2.626634958) and add it to both sides.

Add '2.626634958' to each side of the equation.
3.24137931x + 2.626634958 + x2 = 1.793103448 + 2.626634958

Reorder the terms:
2.626634958 + 3.24137931x + x2 = 1.793103448 + 2.626634958

Combine like terms: 1.793103448 + 2.626634958 = 4.419738406
2.626634958 + 3.24137931x + x2 = 4.419738406

Factor a perfect square on the left side:
(x + 1.620689655)(x + 1.620689655) = 4.419738406

Calculate the square root of the right side: 2.102317389

Break this problem into two subproblems by setting 
(x + 1.620689655) equal to 2.102317389 and -2.102317389.

Subproblem 1

x + 1.620689655 = 2.102317389 Simplifying x + 1.620689655 = 2.102317389 Reorder the terms: 1.620689655 + x = 2.102317389 Solving 1.620689655 + x = 2.102317389 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.620689655' to each side of the equation. 1.620689655 + -1.620689655 + x = 2.102317389 + -1.620689655 Combine like terms: 1.620689655 + -1.620689655 = 0.000000000 0.000000000 + x = 2.102317389 + -1.620689655 x = 2.102317389 + -1.620689655 Combine like terms: 2.102317389 + -1.620689655 = 0.481627734 x = 0.481627734 Simplifying x = 0.481627734

Subproblem 2

x + 1.620689655 = -2.102317389 Simplifying x + 1.620689655 = -2.102317389 Reorder the terms: 1.620689655 + x = -2.102317389 Solving 1.620689655 + x = -2.102317389 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.620689655' to each side of the equation. 1.620689655 + -1.620689655 + x = -2.102317389 + -1.620689655 Combine like terms: 1.620689655 + -1.620689655 = 0.000000000 0.000000000 + x = -2.102317389 + -1.620689655 x = -2.102317389 + -1.620689655 Combine like terms: -2.102317389 + -1.620689655 = -3.723007044 x = -3.723007044 Simplifying x = -3.723007044

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.481627734, -3.723007044}

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