15x^2+40x+17=0

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Solution for 15x^2+40x+17=0 equation:


Simplifying
15x2 + 40x + 17 = 0

Reorder the terms:
17 + 40x + 15x2 = 0

Solving
17 + 40x + 15x2 = 0

Solving for variable 'x'.

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

Divide each side by '15'.
1.133333333 + 2.666666667x + x2 = 0

Move the constant term to the right:

Add '-1.133333333' to each side of the equation.
1.133333333 + 2.666666667x + -1.133333333 + x2 = 0 + -1.133333333

Reorder the terms:
1.133333333 + -1.133333333 + 2.666666667x + x2 = 0 + -1.133333333

Combine like terms: 1.133333333 + -1.133333333 = 0.000000000
0.000000000 + 2.666666667x + x2 = 0 + -1.133333333
2.666666667x + x2 = 0 + -1.133333333

Combine like terms: 0 + -1.133333333 = -1.133333333
2.666666667x + x2 = -1.133333333

The x term is 2.666666667x.  Take half its coefficient (1.333333334).
Square it (1.777777780) and add it to both sides.

Add '1.777777780' to each side of the equation.
2.666666667x + 1.777777780 + x2 = -1.133333333 + 1.777777780

Reorder the terms:
1.777777780 + 2.666666667x + x2 = -1.133333333 + 1.777777780

Combine like terms: -1.133333333 + 1.777777780 = 0.644444447
1.777777780 + 2.666666667x + x2 = 0.644444447

Factor a perfect square on the left side:
(x + 1.333333334)(x + 1.333333334) = 0.644444447

Calculate the square root of the right side: 0.802772974

Break this problem into two subproblems by setting 
(x + 1.333333334) equal to 0.802772974 and -0.802772974.

Subproblem 1

x + 1.333333334 = 0.802772974 Simplifying x + 1.333333334 = 0.802772974 Reorder the terms: 1.333333334 + x = 0.802772974 Solving 1.333333334 + x = 0.802772974 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.333333334' to each side of the equation. 1.333333334 + -1.333333334 + x = 0.802772974 + -1.333333334 Combine like terms: 1.333333334 + -1.333333334 = 0.000000000 0.000000000 + x = 0.802772974 + -1.333333334 x = 0.802772974 + -1.333333334 Combine like terms: 0.802772974 + -1.333333334 = -0.53056036 x = -0.53056036 Simplifying x = -0.53056036

Subproblem 2

x + 1.333333334 = -0.802772974 Simplifying x + 1.333333334 = -0.802772974 Reorder the terms: 1.333333334 + x = -0.802772974 Solving 1.333333334 + x = -0.802772974 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.333333334' to each side of the equation. 1.333333334 + -1.333333334 + x = -0.802772974 + -1.333333334 Combine like terms: 1.333333334 + -1.333333334 = 0.000000000 0.000000000 + x = -0.802772974 + -1.333333334 x = -0.802772974 + -1.333333334 Combine like terms: -0.802772974 + -1.333333334 = -2.136106308 x = -2.136106308 Simplifying x = -2.136106308

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.53056036, -2.136106308}

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