10x^2-6x-15=0

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Solution for 10x^2-6x-15=0 equation:


Simplifying
10x2 + -6x + -15 = 0

Reorder the terms:
-15 + -6x + 10x2 = 0

Solving
-15 + -6x + 10x2 = 0

Solving for variable 'x'.

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

Divide each side by '10'.
-1.5 + -0.6x + x2 = 0

Move the constant term to the right:

Add '1.5' to each side of the equation.
-1.5 + -0.6x + 1.5 + x2 = 0 + 1.5

Reorder the terms:
-1.5 + 1.5 + -0.6x + x2 = 0 + 1.5

Combine like terms: -1.5 + 1.5 = 0.0
0.0 + -0.6x + x2 = 0 + 1.5
-0.6x + x2 = 0 + 1.5

Combine like terms: 0 + 1.5 = 1.5
-0.6x + x2 = 1.5

The x term is -0.6x.  Take half its coefficient (-0.3).
Square it (0.09) and add it to both sides.

Add '0.09' to each side of the equation.
-0.6x + 0.09 + x2 = 1.5 + 0.09

Reorder the terms:
0.09 + -0.6x + x2 = 1.5 + 0.09

Combine like terms: 1.5 + 0.09 = 1.59
0.09 + -0.6x + x2 = 1.59

Factor a perfect square on the left side:
(x + -0.3)(x + -0.3) = 1.59

Calculate the square root of the right side: 1.260952021

Break this problem into two subproblems by setting 
(x + -0.3) equal to 1.260952021 and -1.260952021.

Subproblem 1

x + -0.3 = 1.260952021 Simplifying x + -0.3 = 1.260952021 Reorder the terms: -0.3 + x = 1.260952021 Solving -0.3 + x = 1.260952021 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3' to each side of the equation. -0.3 + 0.3 + x = 1.260952021 + 0.3 Combine like terms: -0.3 + 0.3 = 0.0 0.0 + x = 1.260952021 + 0.3 x = 1.260952021 + 0.3 Combine like terms: 1.260952021 + 0.3 = 1.560952021 x = 1.560952021 Simplifying x = 1.560952021

Subproblem 2

x + -0.3 = -1.260952021 Simplifying x + -0.3 = -1.260952021 Reorder the terms: -0.3 + x = -1.260952021 Solving -0.3 + x = -1.260952021 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3' to each side of the equation. -0.3 + 0.3 + x = -1.260952021 + 0.3 Combine like terms: -0.3 + 0.3 = 0.0 0.0 + x = -1.260952021 + 0.3 x = -1.260952021 + 0.3 Combine like terms: -1.260952021 + 0.3 = -0.960952021 x = -0.960952021 Simplifying x = -0.960952021

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.560952021, -0.960952021}

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