10x^2+15x=-1

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Solution for 10x^2+15x=-1 equation:


Simplifying
10x2 + 15x = -1

Reorder the terms:
15x + 10x2 = -1

Solving
15x + 10x2 = -1

Solving for variable 'x'.

Reorder the terms:
1 + 15x + 10x2 = -1 + 1

Combine like terms: -1 + 1 = 0
1 + 15x + 10x2 = 0

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

Divide each side by '10'.
0.1 + 1.5x + x2 = 0

Move the constant term to the right:

Add '-0.1' to each side of the equation.
0.1 + 1.5x + -0.1 + x2 = 0 + -0.1

Reorder the terms:
0.1 + -0.1 + 1.5x + x2 = 0 + -0.1

Combine like terms: 0.1 + -0.1 = 0.0
0.0 + 1.5x + x2 = 0 + -0.1
1.5x + x2 = 0 + -0.1

Combine like terms: 0 + -0.1 = -0.1
1.5x + x2 = -0.1

The x term is 1.5x.  Take half its coefficient (0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
1.5x + 0.5625 + x2 = -0.1 + 0.5625

Reorder the terms:
0.5625 + 1.5x + x2 = -0.1 + 0.5625

Combine like terms: -0.1 + 0.5625 = 0.4625
0.5625 + 1.5x + x2 = 0.4625

Factor a perfect square on the left side:
(x + 0.75)(x + 0.75) = 0.4625

Calculate the square root of the right side: 0.680073525

Break this problem into two subproblems by setting 
(x + 0.75) equal to 0.680073525 and -0.680073525.

Subproblem 1

x + 0.75 = 0.680073525 Simplifying x + 0.75 = 0.680073525 Reorder the terms: 0.75 + x = 0.680073525 Solving 0.75 + x = 0.680073525 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = 0.680073525 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = 0.680073525 + -0.75 x = 0.680073525 + -0.75 Combine like terms: 0.680073525 + -0.75 = -0.069926475 x = -0.069926475 Simplifying x = -0.069926475

Subproblem 2

x + 0.75 = -0.680073525 Simplifying x + 0.75 = -0.680073525 Reorder the terms: 0.75 + x = -0.680073525 Solving 0.75 + x = -0.680073525 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = -0.680073525 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = -0.680073525 + -0.75 x = -0.680073525 + -0.75 Combine like terms: -0.680073525 + -0.75 = -1.430073525 x = -1.430073525 Simplifying x = -1.430073525

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.069926475, -1.430073525}

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