2x^2+40x=3201

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Solution for 2x^2+40x=3201 equation:


Simplifying
2x2 + 40x = 3201

Reorder the terms:
40x + 2x2 = 3201

Solving
40x + 2x2 = 3201

Solving for variable 'x'.

Reorder the terms:
-3201 + 40x + 2x2 = 3201 + -3201

Combine like terms: 3201 + -3201 = 0
-3201 + 40x + 2x2 = 0

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

Divide each side by '2'.
-1600.5 + 20x + x2 = 0

Move the constant term to the right:

Add '1600.5' to each side of the equation.
-1600.5 + 20x + 1600.5 + x2 = 0 + 1600.5

Reorder the terms:
-1600.5 + 1600.5 + 20x + x2 = 0 + 1600.5

Combine like terms: -1600.5 + 1600.5 = 0.0
0.0 + 20x + x2 = 0 + 1600.5
20x + x2 = 0 + 1600.5

Combine like terms: 0 + 1600.5 = 1600.5
20x + x2 = 1600.5

The x term is 20x.  Take half its coefficient (10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
20x + 100 + x2 = 1600.5 + 100

Reorder the terms:
100 + 20x + x2 = 1600.5 + 100

Combine like terms: 1600.5 + 100 = 1700.5
100 + 20x + x2 = 1700.5

Factor a perfect square on the left side:
(x + 10)(x + 10) = 1700.5

Calculate the square root of the right side: 41.237119201

Break this problem into two subproblems by setting 
(x + 10) equal to 41.237119201 and -41.237119201.

Subproblem 1

x + 10 = 41.237119201 Simplifying x + 10 = 41.237119201 Reorder the terms: 10 + x = 41.237119201 Solving 10 + x = 41.237119201 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + x = 41.237119201 + -10 Combine like terms: 10 + -10 = 0 0 + x = 41.237119201 + -10 x = 41.237119201 + -10 Combine like terms: 41.237119201 + -10 = 31.237119201 x = 31.237119201 Simplifying x = 31.237119201

Subproblem 2

x + 10 = -41.237119201 Simplifying x + 10 = -41.237119201 Reorder the terms: 10 + x = -41.237119201 Solving 10 + x = -41.237119201 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + x = -41.237119201 + -10 Combine like terms: 10 + -10 = 0 0 + x = -41.237119201 + -10 x = -41.237119201 + -10 Combine like terms: -41.237119201 + -10 = -51.237119201 x = -51.237119201 Simplifying x = -51.237119201

Solution

The solution to the problem is based on the solutions from the subproblems. x = {31.237119201, -51.237119201}

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