10x^2-3x-15=0

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Solution for 10x^2-3x-15=0 equation:


Simplifying
10x2 + -3x + -15 = 0

Reorder the terms:
-15 + -3x + 10x2 = 0

Solving
-15 + -3x + 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 + -0.3x + x2 = 0

Move the constant term to the right:

Add '1.5' to each side of the equation.
-1.5 + -0.3x + 1.5 + x2 = 0 + 1.5

Reorder the terms:
-1.5 + 1.5 + -0.3x + x2 = 0 + 1.5

Combine like terms: -1.5 + 1.5 = 0.0
0.0 + -0.3x + x2 = 0 + 1.5
-0.3x + x2 = 0 + 1.5

Combine like terms: 0 + 1.5 = 1.5
-0.3x + x2 = 1.5

The x term is -0.3x.  Take half its coefficient (-0.15).
Square it (0.0225) and add it to both sides.

Add '0.0225' to each side of the equation.
-0.3x + 0.0225 + x2 = 1.5 + 0.0225

Reorder the terms:
0.0225 + -0.3x + x2 = 1.5 + 0.0225

Combine like terms: 1.5 + 0.0225 = 1.5225
0.0225 + -0.3x + x2 = 1.5225

Factor a perfect square on the left side:
(x + -0.15)(x + -0.15) = 1.5225

Calculate the square root of the right side: 1.233896268

Break this problem into two subproblems by setting 
(x + -0.15) equal to 1.233896268 and -1.233896268.

Subproblem 1

x + -0.15 = 1.233896268 Simplifying x + -0.15 = 1.233896268 Reorder the terms: -0.15 + x = 1.233896268 Solving -0.15 + x = 1.233896268 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.15' to each side of the equation. -0.15 + 0.15 + x = 1.233896268 + 0.15 Combine like terms: -0.15 + 0.15 = 0.00 0.00 + x = 1.233896268 + 0.15 x = 1.233896268 + 0.15 Combine like terms: 1.233896268 + 0.15 = 1.383896268 x = 1.383896268 Simplifying x = 1.383896268

Subproblem 2

x + -0.15 = -1.233896268 Simplifying x + -0.15 = -1.233896268 Reorder the terms: -0.15 + x = -1.233896268 Solving -0.15 + x = -1.233896268 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.15' to each side of the equation. -0.15 + 0.15 + x = -1.233896268 + 0.15 Combine like terms: -0.15 + 0.15 = 0.00 0.00 + x = -1.233896268 + 0.15 x = -1.233896268 + 0.15 Combine like terms: -1.233896268 + 0.15 = -1.083896268 x = -1.083896268 Simplifying x = -1.083896268

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.383896268, -1.083896268}

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