x+2x^2-10+15=320

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Solution for x+2x^2-10+15=320 equation:


Simplifying
x + 2x2 + -10 + 15 = 320

Reorder the terms:
-10 + 15 + x + 2x2 = 320

Combine like terms: -10 + 15 = 5
5 + x + 2x2 = 320

Solving
5 + x + 2x2 = 320

Solving for variable 'x'.

Reorder the terms:
5 + -320 + x + 2x2 = 320 + -320

Combine like terms: 5 + -320 = -315
-315 + x + 2x2 = 320 + -320

Combine like terms: 320 + -320 = 0
-315 + x + 2x2 = 0

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

Divide each side by '2'.
-157.5 + 0.5x + x2 = 0

Move the constant term to the right:

Add '157.5' to each side of the equation.
-157.5 + 0.5x + 157.5 + x2 = 0 + 157.5

Reorder the terms:
-157.5 + 157.5 + 0.5x + x2 = 0 + 157.5

Combine like terms: -157.5 + 157.5 = 0.0
0.0 + 0.5x + x2 = 0 + 157.5
0.5x + x2 = 0 + 157.5

Combine like terms: 0 + 157.5 = 157.5
0.5x + x2 = 157.5

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
0.5x + 0.25 + x2 = 157.5 + 0.25

Reorder the terms:
0.25 + 0.5x + x2 = 157.5 + 0.25

Combine like terms: 157.5 + 0.25 = 157.75
0.25 + 0.5x + x2 = 157.75

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 157.75

Calculate the square root of the right side: 12.559856687

Break this problem into two subproblems by setting 
(x + 0.5) equal to 12.559856687 and -12.559856687.

Subproblem 1

x + 0.5 = 12.559856687 Simplifying x + 0.5 = 12.559856687 Reorder the terms: 0.5 + x = 12.559856687 Solving 0.5 + x = 12.559856687 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 12.559856687 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 12.559856687 + -0.5 x = 12.559856687 + -0.5 Combine like terms: 12.559856687 + -0.5 = 12.059856687 x = 12.059856687 Simplifying x = 12.059856687

Subproblem 2

x + 0.5 = -12.559856687 Simplifying x + 0.5 = -12.559856687 Reorder the terms: 0.5 + x = -12.559856687 Solving 0.5 + x = -12.559856687 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -12.559856687 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -12.559856687 + -0.5 x = -12.559856687 + -0.5 Combine like terms: -12.559856687 + -0.5 = -13.059856687 x = -13.059856687 Simplifying x = -13.059856687

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.059856687, -13.059856687}

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