2x^2=7-20x

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Solution for 2x^2=7-20x equation:


Simplifying
2x2 = 7 + -20x

Solving
2x2 = 7 + -20x

Solving for variable 'x'.

Reorder the terms:
-7 + 20x + 2x2 = 7 + -20x + -7 + 20x

Reorder the terms:
-7 + 20x + 2x2 = 7 + -7 + -20x + 20x

Combine like terms: 7 + -7 = 0
-7 + 20x + 2x2 = 0 + -20x + 20x
-7 + 20x + 2x2 = -20x + 20x

Combine like terms: -20x + 20x = 0
-7 + 20x + 2x2 = 0

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

Divide each side by '2'.
-3.5 + 10x + x2 = 0

Move the constant term to the right:

Add '3.5' to each side of the equation.
-3.5 + 10x + 3.5 + x2 = 0 + 3.5

Reorder the terms:
-3.5 + 3.5 + 10x + x2 = 0 + 3.5

Combine like terms: -3.5 + 3.5 = 0.0
0.0 + 10x + x2 = 0 + 3.5
10x + x2 = 0 + 3.5

Combine like terms: 0 + 3.5 = 3.5
10x + x2 = 3.5

The x term is 10x.  Take half its coefficient (5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
10x + 25 + x2 = 3.5 + 25

Reorder the terms:
25 + 10x + x2 = 3.5 + 25

Combine like terms: 3.5 + 25 = 28.5
25 + 10x + x2 = 28.5

Factor a perfect square on the left side:
(x + 5)(x + 5) = 28.5

Calculate the square root of the right side: 5.338539126

Break this problem into two subproblems by setting 
(x + 5) equal to 5.338539126 and -5.338539126.

Subproblem 1

x + 5 = 5.338539126 Simplifying x + 5 = 5.338539126 Reorder the terms: 5 + x = 5.338539126 Solving 5 + x = 5.338539126 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = 5.338539126 + -5 Combine like terms: 5 + -5 = 0 0 + x = 5.338539126 + -5 x = 5.338539126 + -5 Combine like terms: 5.338539126 + -5 = 0.338539126 x = 0.338539126 Simplifying x = 0.338539126

Subproblem 2

x + 5 = -5.338539126 Simplifying x + 5 = -5.338539126 Reorder the terms: 5 + x = -5.338539126 Solving 5 + x = -5.338539126 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = -5.338539126 + -5 Combine like terms: 5 + -5 = 0 0 + x = -5.338539126 + -5 x = -5.338539126 + -5 Combine like terms: -5.338539126 + -5 = -10.338539126 x = -10.338539126 Simplifying x = -10.338539126

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.338539126, -10.338539126}

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