(x^2)+3x=308

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Solution for (x^2)+3x=308 equation:


Simplifying
(x2) + 3x = 308
x2 + 3x = 308

Reorder the terms:
3x + x2 = 308

Solving
3x + x2 = 308

Solving for variable 'x'.

Reorder the terms:
-308 + 3x + x2 = 308 + -308

Combine like terms: 308 + -308 = 0
-308 + 3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '308' to each side of the equation.
-308 + 3x + 308 + x2 = 0 + 308

Reorder the terms:
-308 + 308 + 3x + x2 = 0 + 308

Combine like terms: -308 + 308 = 0
0 + 3x + x2 = 0 + 308
3x + x2 = 0 + 308

Combine like terms: 0 + 308 = 308
3x + x2 = 308

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 = 308 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 308 + 2.25

Combine like terms: 308 + 2.25 = 310.25
2.25 + 3x + x2 = 310.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 310.25

Calculate the square root of the right side: 17.613914954

Break this problem into two subproblems by setting 
(x + 1.5) equal to 17.613914954 and -17.613914954.

Subproblem 1

x + 1.5 = 17.613914954 Simplifying x + 1.5 = 17.613914954 Reorder the terms: 1.5 + x = 17.613914954 Solving 1.5 + x = 17.613914954 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 = 17.613914954 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 17.613914954 + -1.5 x = 17.613914954 + -1.5 Combine like terms: 17.613914954 + -1.5 = 16.113914954 x = 16.113914954 Simplifying x = 16.113914954

Subproblem 2

x + 1.5 = -17.613914954 Simplifying x + 1.5 = -17.613914954 Reorder the terms: 1.5 + x = -17.613914954 Solving 1.5 + x = -17.613914954 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 = -17.613914954 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -17.613914954 + -1.5 x = -17.613914954 + -1.5 Combine like terms: -17.613914954 + -1.5 = -19.113914954 x = -19.113914954 Simplifying x = -19.113914954

Solution

The solution to the problem is based on the solutions from the subproblems. x = {16.113914954, -19.113914954}

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