x^2+3x=910

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Solution for x^2+3x=910 equation:


Simplifying
x2 + 3x = 910

Reorder the terms:
3x + x2 = 910

Solving
3x + x2 = 910

Solving for variable 'x'.

Reorder the terms:
-910 + 3x + x2 = 910 + -910

Combine like terms: 910 + -910 = 0
-910 + 3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '910' to each side of the equation.
-910 + 3x + 910 + x2 = 0 + 910

Reorder the terms:
-910 + 910 + 3x + x2 = 0 + 910

Combine like terms: -910 + 910 = 0
0 + 3x + x2 = 0 + 910
3x + x2 = 0 + 910

Combine like terms: 0 + 910 = 910
3x + x2 = 910

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 = 910 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 910 + 2.25

Combine like terms: 910 + 2.25 = 912.25
2.25 + 3x + x2 = 912.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 912.25

Calculate the square root of the right side: 30.203476621

Break this problem into two subproblems by setting 
(x + 1.5) equal to 30.203476621 and -30.203476621.

Subproblem 1

x + 1.5 = 30.203476621 Simplifying x + 1.5 = 30.203476621 Reorder the terms: 1.5 + x = 30.203476621 Solving 1.5 + x = 30.203476621 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 = 30.203476621 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 30.203476621 + -1.5 x = 30.203476621 + -1.5 Combine like terms: 30.203476621 + -1.5 = 28.703476621 x = 28.703476621 Simplifying x = 28.703476621

Subproblem 2

x + 1.5 = -30.203476621 Simplifying x + 1.5 = -30.203476621 Reorder the terms: 1.5 + x = -30.203476621 Solving 1.5 + x = -30.203476621 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 = -30.203476621 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -30.203476621 + -1.5 x = -30.203476621 + -1.5 Combine like terms: -30.203476621 + -1.5 = -31.703476621 x = -31.703476621 Simplifying x = -31.703476621

Solution

The solution to the problem is based on the solutions from the subproblems. x = {28.703476621, -31.703476621}

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