x^2+3x=201

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Solution for x^2+3x=201 equation:


Simplifying
x2 + 3x = 201

Reorder the terms:
3x + x2 = 201

Solving
3x + x2 = 201

Solving for variable 'x'.

Reorder the terms:
-201 + 3x + x2 = 201 + -201

Combine like terms: 201 + -201 = 0
-201 + 3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '201' to each side of the equation.
-201 + 3x + 201 + x2 = 0 + 201

Reorder the terms:
-201 + 201 + 3x + x2 = 0 + 201

Combine like terms: -201 + 201 = 0
0 + 3x + x2 = 0 + 201
3x + x2 = 0 + 201

Combine like terms: 0 + 201 = 201
3x + x2 = 201

The x term is 3x.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3x + 2.25 + x2 = 201 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 201 + 2.25

Combine like terms: 201 + 2.25 = 203.25
2.25 + 3x + x2 = 203.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 203.25

Calculate the square root of the right side: 14.256577429

Break this problem into two subproblems by setting 
(x + 1.5) equal to 14.256577429 and -14.256577429.

Subproblem 1

x + 1.5 = 14.256577429 Simplifying x + 1.5 = 14.256577429 Reorder the terms: 1.5 + x = 14.256577429 Solving 1.5 + x = 14.256577429 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = 14.256577429 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 14.256577429 + -1.5 x = 14.256577429 + -1.5 Combine like terms: 14.256577429 + -1.5 = 12.756577429 x = 12.756577429 Simplifying x = 12.756577429

Subproblem 2

x + 1.5 = -14.256577429 Simplifying x + 1.5 = -14.256577429 Reorder the terms: 1.5 + x = -14.256577429 Solving 1.5 + x = -14.256577429 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = -14.256577429 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -14.256577429 + -1.5 x = -14.256577429 + -1.5 Combine like terms: -14.256577429 + -1.5 = -15.756577429 x = -15.756577429 Simplifying x = -15.756577429

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.756577429, -15.756577429}

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