3x-5=2x^2-14x

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Solution for 3x-5=2x^2-14x equation:


Simplifying
3x + -5 = 2x2 + -14x

Reorder the terms:
-5 + 3x = 2x2 + -14x

Reorder the terms:
-5 + 3x = -14x + 2x2

Solving
-5 + 3x = -14x + 2x2

Solving for variable 'x'.

Combine like terms: 3x + 14x = 17x
-5 + 17x + -2x2 = -14x + 2x2 + 14x + -2x2

Reorder the terms:
-5 + 17x + -2x2 = -14x + 14x + 2x2 + -2x2

Combine like terms: -14x + 14x = 0
-5 + 17x + -2x2 = 0 + 2x2 + -2x2
-5 + 17x + -2x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
-5 + 17x + -2x2 = 0

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

Divide each side by '-2'.
2.5 + -8.5x + x2 = 0

Move the constant term to the right:

Add '-2.5' to each side of the equation.
2.5 + -8.5x + -2.5 + x2 = 0 + -2.5

Reorder the terms:
2.5 + -2.5 + -8.5x + x2 = 0 + -2.5

Combine like terms: 2.5 + -2.5 = 0.0
0.0 + -8.5x + x2 = 0 + -2.5
-8.5x + x2 = 0 + -2.5

Combine like terms: 0 + -2.5 = -2.5
-8.5x + x2 = -2.5

The x term is -8.5x.  Take half its coefficient (-4.25).
Square it (18.0625) and add it to both sides.

Add '18.0625' to each side of the equation.
-8.5x + 18.0625 + x2 = -2.5 + 18.0625

Reorder the terms:
18.0625 + -8.5x + x2 = -2.5 + 18.0625

Combine like terms: -2.5 + 18.0625 = 15.5625
18.0625 + -8.5x + x2 = 15.5625

Factor a perfect square on the left side:
(x + -4.25)(x + -4.25) = 15.5625

Calculate the square root of the right side: 3.94493346

Break this problem into two subproblems by setting 
(x + -4.25) equal to 3.94493346 and -3.94493346.

Subproblem 1

x + -4.25 = 3.94493346 Simplifying x + -4.25 = 3.94493346 Reorder the terms: -4.25 + x = 3.94493346 Solving -4.25 + x = 3.94493346 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.25' to each side of the equation. -4.25 + 4.25 + x = 3.94493346 + 4.25 Combine like terms: -4.25 + 4.25 = 0.00 0.00 + x = 3.94493346 + 4.25 x = 3.94493346 + 4.25 Combine like terms: 3.94493346 + 4.25 = 8.19493346 x = 8.19493346 Simplifying x = 8.19493346

Subproblem 2

x + -4.25 = -3.94493346 Simplifying x + -4.25 = -3.94493346 Reorder the terms: -4.25 + x = -3.94493346 Solving -4.25 + x = -3.94493346 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.25' to each side of the equation. -4.25 + 4.25 + x = -3.94493346 + 4.25 Combine like terms: -4.25 + 4.25 = 0.00 0.00 + x = -3.94493346 + 4.25 x = -3.94493346 + 4.25 Combine like terms: -3.94493346 + 4.25 = 0.30506654 x = 0.30506654 Simplifying x = 0.30506654

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.19493346, 0.30506654}

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