(4)x*x+2x=17

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Solution for (4)x*x+2x=17 equation:


Simplifying
(4) * x * x + 2x = 17

Multiply x * x
4x2 + 2x = 17

Reorder the terms:
2x + 4x2 = 17

Solving
2x + 4x2 = 17

Solving for variable 'x'.

Reorder the terms:
-17 + 2x + 4x2 = 17 + -17

Combine like terms: 17 + -17 = 0
-17 + 2x + 4x2 = 0

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

Divide each side by '4'.
-4.25 + 0.5x + x2 = 0

Move the constant term to the right:

Add '4.25' to each side of the equation.
-4.25 + 0.5x + 4.25 + x2 = 0 + 4.25

Reorder the terms:
-4.25 + 4.25 + 0.5x + x2 = 0 + 4.25

Combine like terms: -4.25 + 4.25 = 0.00
0.00 + 0.5x + x2 = 0 + 4.25
0.5x + x2 = 0 + 4.25

Combine like terms: 0 + 4.25 = 4.25
0.5x + x2 = 4.25

The x term is 0.5x.  Take half its coefficient (0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
0.5x + 0.0625 + x2 = 4.25 + 0.0625

Reorder the terms:
0.0625 + 0.5x + x2 = 4.25 + 0.0625

Combine like terms: 4.25 + 0.0625 = 4.3125
0.0625 + 0.5x + x2 = 4.3125

Factor a perfect square on the left side:
(x + 0.25)(x + 0.25) = 4.3125

Calculate the square root of the right side: 2.076655966

Break this problem into two subproblems by setting 
(x + 0.25) equal to 2.076655966 and -2.076655966.

Subproblem 1

x + 0.25 = 2.076655966 Simplifying x + 0.25 = 2.076655966 Reorder the terms: 0.25 + x = 2.076655966 Solving 0.25 + x = 2.076655966 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + x = 2.076655966 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = 2.076655966 + -0.25 x = 2.076655966 + -0.25 Combine like terms: 2.076655966 + -0.25 = 1.826655966 x = 1.826655966 Simplifying x = 1.826655966

Subproblem 2

x + 0.25 = -2.076655966 Simplifying x + 0.25 = -2.076655966 Reorder the terms: 0.25 + x = -2.076655966 Solving 0.25 + x = -2.076655966 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + x = -2.076655966 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = -2.076655966 + -0.25 x = -2.076655966 + -0.25 Combine like terms: -2.076655966 + -0.25 = -2.326655966 x = -2.326655966 Simplifying x = -2.326655966

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.826655966, -2.326655966}

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