4.1=x^2+3x

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Solution for 4.1=x^2+3x equation:


Simplifying
4.1 = x2 + 3x

Reorder the terms:
4.1 = 3x + x2

Solving
4.1 = 3x + x2

Solving for variable 'x'.

Reorder the terms:
4.1 + -3x + -1x2 = 3x + -3x + x2 + -1x2

Combine like terms: 3x + -3x = 0
4.1 + -3x + -1x2 = 0 + x2 + -1x2
4.1 + -3x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
4.1 + -3x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-4.1 + 3x + x2 = 0

Move the constant term to the right:

Add '4.1' to each side of the equation.
-4.1 + 3x + 4.1 + x2 = 0 + 4.1

Reorder the terms:
-4.1 + 4.1 + 3x + x2 = 0 + 4.1

Combine like terms: -4.1 + 4.1 = 0.0
0.0 + 3x + x2 = 0 + 4.1
3x + x2 = 0 + 4.1

Combine like terms: 0 + 4.1 = 4.1
3x + x2 = 4.1

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 = 4.1 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 4.1 + 2.25

Combine like terms: 4.1 + 2.25 = 6.35
2.25 + 3x + x2 = 6.35

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 6.35

Calculate the square root of the right side: 2.519920634

Break this problem into two subproblems by setting 
(x + 1.5) equal to 2.519920634 and -2.519920634.

Subproblem 1

x + 1.5 = 2.519920634 Simplifying x + 1.5 = 2.519920634 Reorder the terms: 1.5 + x = 2.519920634 Solving 1.5 + x = 2.519920634 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 = 2.519920634 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 2.519920634 + -1.5 x = 2.519920634 + -1.5 Combine like terms: 2.519920634 + -1.5 = 1.019920634 x = 1.019920634 Simplifying x = 1.019920634

Subproblem 2

x + 1.5 = -2.519920634 Simplifying x + 1.5 = -2.519920634 Reorder the terms: 1.5 + x = -2.519920634 Solving 1.5 + x = -2.519920634 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 = -2.519920634 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -2.519920634 + -1.5 x = -2.519920634 + -1.5 Combine like terms: -2.519920634 + -1.5 = -4.019920634 x = -4.019920634 Simplifying x = -4.019920634

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.019920634, -4.019920634}

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