(2)(x)(x)+20x=25

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Solution for (2)(x)(x)+20x=25 equation:


Simplifying
(2)(x)(x) + 20x = 25

Multiply x * x
2x2 + 20x = 25

Reorder the terms:
20x + 2x2 = 25

Solving
20x + 2x2 = 25

Solving for variable 'x'.

Reorder the terms:
-25 + 20x + 2x2 = 25 + -25

Combine like terms: 25 + -25 = 0
-25 + 20x + 2x2 = 0

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

Divide each side by '2'.
-12.5 + 10x + x2 = 0

Move the constant term to the right:

Add '12.5' to each side of the equation.
-12.5 + 10x + 12.5 + x2 = 0 + 12.5

Reorder the terms:
-12.5 + 12.5 + 10x + x2 = 0 + 12.5

Combine like terms: -12.5 + 12.5 = 0.0
0.0 + 10x + x2 = 0 + 12.5
10x + x2 = 0 + 12.5

Combine like terms: 0 + 12.5 = 12.5
10x + x2 = 12.5

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 = 12.5 + 25

Reorder the terms:
25 + 10x + x2 = 12.5 + 25

Combine like terms: 12.5 + 25 = 37.5
25 + 10x + x2 = 37.5

Factor a perfect square on the left side:
(x + 5)(x + 5) = 37.5

Calculate the square root of the right side: 6.123724357

Break this problem into two subproblems by setting 
(x + 5) equal to 6.123724357 and -6.123724357.

Subproblem 1

x + 5 = 6.123724357 Simplifying x + 5 = 6.123724357 Reorder the terms: 5 + x = 6.123724357 Solving 5 + x = 6.123724357 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 = 6.123724357 + -5 Combine like terms: 5 + -5 = 0 0 + x = 6.123724357 + -5 x = 6.123724357 + -5 Combine like terms: 6.123724357 + -5 = 1.123724357 x = 1.123724357 Simplifying x = 1.123724357

Subproblem 2

x + 5 = -6.123724357 Simplifying x + 5 = -6.123724357 Reorder the terms: 5 + x = -6.123724357 Solving 5 + x = -6.123724357 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 = -6.123724357 + -5 Combine like terms: 5 + -5 = 0 0 + x = -6.123724357 + -5 x = -6.123724357 + -5 Combine like terms: -6.123724357 + -5 = -11.123724357 x = -11.123724357 Simplifying x = -11.123724357

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.123724357, -11.123724357}

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