3x+x^2=43

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Solution for 3x+x^2=43 equation:


Simplifying
3x + x2 = 43

Solving
3x + x2 = 43

Solving for variable 'x'.

Reorder the terms:
-43 + 3x + x2 = 43 + -43

Combine like terms: 43 + -43 = 0
-43 + 3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '43' to each side of the equation.
-43 + 3x + 43 + x2 = 0 + 43

Reorder the terms:
-43 + 43 + 3x + x2 = 0 + 43

Combine like terms: -43 + 43 = 0
0 + 3x + x2 = 0 + 43
3x + x2 = 0 + 43

Combine like terms: 0 + 43 = 43
3x + x2 = 43

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 = 43 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 43 + 2.25

Combine like terms: 43 + 2.25 = 45.25
2.25 + 3x + x2 = 45.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 45.25

Calculate the square root of the right side: 6.726812024

Break this problem into two subproblems by setting 
(x + 1.5) equal to 6.726812024 and -6.726812024.

Subproblem 1

x + 1.5 = 6.726812024 Simplifying x + 1.5 = 6.726812024 Reorder the terms: 1.5 + x = 6.726812024 Solving 1.5 + x = 6.726812024 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 = 6.726812024 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 6.726812024 + -1.5 x = 6.726812024 + -1.5 Combine like terms: 6.726812024 + -1.5 = 5.226812024 x = 5.226812024 Simplifying x = 5.226812024

Subproblem 2

x + 1.5 = -6.726812024 Simplifying x + 1.5 = -6.726812024 Reorder the terms: 1.5 + x = -6.726812024 Solving 1.5 + x = -6.726812024 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 = -6.726812024 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -6.726812024 + -1.5 x = -6.726812024 + -1.5 Combine like terms: -6.726812024 + -1.5 = -8.226812024 x = -8.226812024 Simplifying x = -8.226812024

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.226812024, -8.226812024}

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