10x^2+33x-15=0

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Solution for 10x^2+33x-15=0 equation:


Simplifying
10x2 + 33x + -15 = 0

Reorder the terms:
-15 + 33x + 10x2 = 0

Solving
-15 + 33x + 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 + 3.3x + x2 = 0

Move the constant term to the right:

Add '1.5' to each side of the equation.
-1.5 + 3.3x + 1.5 + x2 = 0 + 1.5

Reorder the terms:
-1.5 + 1.5 + 3.3x + x2 = 0 + 1.5

Combine like terms: -1.5 + 1.5 = 0.0
0.0 + 3.3x + x2 = 0 + 1.5
3.3x + x2 = 0 + 1.5

Combine like terms: 0 + 1.5 = 1.5
3.3x + x2 = 1.5

The x term is 3.3x.  Take half its coefficient (1.65).
Square it (2.7225) and add it to both sides.

Add '2.7225' to each side of the equation.
3.3x + 2.7225 + x2 = 1.5 + 2.7225

Reorder the terms:
2.7225 + 3.3x + x2 = 1.5 + 2.7225

Combine like terms: 1.5 + 2.7225 = 4.2225
2.7225 + 3.3x + x2 = 4.2225

Factor a perfect square on the left side:
(x + 1.65)(x + 1.65) = 4.2225

Calculate the square root of the right side: 2.054872259

Break this problem into two subproblems by setting 
(x + 1.65) equal to 2.054872259 and -2.054872259.

Subproblem 1

x + 1.65 = 2.054872259 Simplifying x + 1.65 = 2.054872259 Reorder the terms: 1.65 + x = 2.054872259 Solving 1.65 + x = 2.054872259 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.65' to each side of the equation. 1.65 + -1.65 + x = 2.054872259 + -1.65 Combine like terms: 1.65 + -1.65 = 0.00 0.00 + x = 2.054872259 + -1.65 x = 2.054872259 + -1.65 Combine like terms: 2.054872259 + -1.65 = 0.404872259 x = 0.404872259 Simplifying x = 0.404872259

Subproblem 2

x + 1.65 = -2.054872259 Simplifying x + 1.65 = -2.054872259 Reorder the terms: 1.65 + x = -2.054872259 Solving 1.65 + x = -2.054872259 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.65' to each side of the equation. 1.65 + -1.65 + x = -2.054872259 + -1.65 Combine like terms: 1.65 + -1.65 = 0.00 0.00 + x = -2.054872259 + -1.65 x = -2.054872259 + -1.65 Combine like terms: -2.054872259 + -1.65 = -3.704872259 x = -3.704872259 Simplifying x = -3.704872259

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.404872259, -3.704872259}

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