14x+3.5x^2=15

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Solution for 14x+3.5x^2=15 equation:


Simplifying
14x + 3.5x2 = 15

Solving
14x + 3.5x2 = 15

Solving for variable 'x'.

Reorder the terms:
-15 + 14x + 3.5x2 = 15 + -15

Combine like terms: 15 + -15 = 0
-15 + 14x + 3.5x2 = 0

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

Divide each side by '3.5'.
-4.285714286 + 4x + x2 = 0

Move the constant term to the right:

Add '4.285714286' to each side of the equation.
-4.285714286 + 4x + 4.285714286 + x2 = 0 + 4.285714286

Reorder the terms:
-4.285714286 + 4.285714286 + 4x + x2 = 0 + 4.285714286

Combine like terms: -4.285714286 + 4.285714286 = 0.000000000
0.000000000 + 4x + x2 = 0 + 4.285714286
4x + x2 = 0 + 4.285714286

Combine like terms: 0 + 4.285714286 = 4.285714286
4x + x2 = 4.285714286

The x term is 4x.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4x + 4 + x2 = 4.285714286 + 4

Reorder the terms:
4 + 4x + x2 = 4.285714286 + 4

Combine like terms: 4.285714286 + 4 = 8.285714286
4 + 4x + x2 = 8.285714286

Factor a perfect square on the left side:
(x + 2)(x + 2) = 8.285714286

Calculate the square root of the right side: 2.878491669

Break this problem into two subproblems by setting 
(x + 2) equal to 2.878491669 and -2.878491669.

Subproblem 1

x + 2 = 2.878491669 Simplifying x + 2 = 2.878491669 Reorder the terms: 2 + x = 2.878491669 Solving 2 + x = 2.878491669 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 2.878491669 + -2 Combine like terms: 2 + -2 = 0 0 + x = 2.878491669 + -2 x = 2.878491669 + -2 Combine like terms: 2.878491669 + -2 = 0.878491669 x = 0.878491669 Simplifying x = 0.878491669

Subproblem 2

x + 2 = -2.878491669 Simplifying x + 2 = -2.878491669 Reorder the terms: 2 + x = -2.878491669 Solving 2 + x = -2.878491669 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = -2.878491669 + -2 Combine like terms: 2 + -2 = 0 0 + x = -2.878491669 + -2 x = -2.878491669 + -2 Combine like terms: -2.878491669 + -2 = -4.878491669 x = -4.878491669 Simplifying x = -4.878491669

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.878491669, -4.878491669}

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