612=x^2+3x

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Solution for 612=x^2+3x equation:


Simplifying
612 = x2 + 3x

Reorder the terms:
612 = 3x + x2

Solving
612 = 3x + x2

Solving for variable 'x'.

Reorder the terms:
612 + -3x + -1x2 = 3x + -3x + x2 + -1x2

Combine like terms: 3x + -3x = 0
612 + -3x + -1x2 = 0 + x2 + -1x2
612 + -3x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
612 + -3x + -1x2 = 0

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

Divide each side by '-1'.
-612 + 3x + x2 = 0

Move the constant term to the right:

Add '612' to each side of the equation.
-612 + 3x + 612 + x2 = 0 + 612

Reorder the terms:
-612 + 612 + 3x + x2 = 0 + 612

Combine like terms: -612 + 612 = 0
0 + 3x + x2 = 0 + 612
3x + x2 = 0 + 612

Combine like terms: 0 + 612 = 612
3x + x2 = 612

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 = 612 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 612 + 2.25

Combine like terms: 612 + 2.25 = 614.25
2.25 + 3x + x2 = 614.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 614.25

Calculate the square root of the right side: 24.784067463

Break this problem into two subproblems by setting 
(x + 1.5) equal to 24.784067463 and -24.784067463.

Subproblem 1

x + 1.5 = 24.784067463 Simplifying x + 1.5 = 24.784067463 Reorder the terms: 1.5 + x = 24.784067463 Solving 1.5 + x = 24.784067463 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 = 24.784067463 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 24.784067463 + -1.5 x = 24.784067463 + -1.5 Combine like terms: 24.784067463 + -1.5 = 23.284067463 x = 23.284067463 Simplifying x = 23.284067463

Subproblem 2

x + 1.5 = -24.784067463 Simplifying x + 1.5 = -24.784067463 Reorder the terms: 1.5 + x = -24.784067463 Solving 1.5 + x = -24.784067463 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 = -24.784067463 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -24.784067463 + -1.5 x = -24.784067463 + -1.5 Combine like terms: -24.784067463 + -1.5 = -26.284067463 x = -26.284067463 Simplifying x = -26.284067463

Solution

The solution to the problem is based on the solutions from the subproblems. x = {23.284067463, -26.284067463}

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