3x^2+3x=35

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Solution for 3x^2+3x=35 equation:


Simplifying
3x2 + 3x = 35

Reorder the terms:
3x + 3x2 = 35

Solving
3x + 3x2 = 35

Solving for variable 'x'.

Reorder the terms:
-35 + 3x + 3x2 = 35 + -35

Combine like terms: 35 + -35 = 0
-35 + 3x + 3x2 = 0

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

Divide each side by '3'.
-11.66666667 + x + x2 = 0

Move the constant term to the right:

Add '11.66666667' to each side of the equation.
-11.66666667 + x + 11.66666667 + x2 = 0 + 11.66666667

Reorder the terms:
-11.66666667 + 11.66666667 + x + x2 = 0 + 11.66666667

Combine like terms: -11.66666667 + 11.66666667 = 0.00000000
0.00000000 + x + x2 = 0 + 11.66666667
x + x2 = 0 + 11.66666667

Combine like terms: 0 + 11.66666667 = 11.66666667
x + x2 = 11.66666667

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
 + 0.25 + x2 = 11.66666667 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x2 = 11.66666667 + 0.25

Combine like terms: 11.66666667 + 0.25 = 11.91666667
1.25 + x2 = 11.91666667

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 11.91666667

Calculate the square root of the right side: 3.45205253

Break this problem into two subproblems by setting 
(x + 0.5) equal to 3.45205253 and -3.45205253.

Subproblem 1

x + 0.5 = 3.45205253 Simplifying x + 0.5 = 3.45205253 Reorder the terms: 0.5 + x = 3.45205253 Solving 0.5 + x = 3.45205253 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 3.45205253 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 3.45205253 + -0.5 x = 3.45205253 + -0.5 Combine like terms: 3.45205253 + -0.5 = 2.95205253 x = 2.95205253 Simplifying x = 2.95205253

Subproblem 2

x + 0.5 = -3.45205253 Simplifying x + 0.5 = -3.45205253 Reorder the terms: 0.5 + x = -3.45205253 Solving 0.5 + x = -3.45205253 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -3.45205253 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -3.45205253 + -0.5 x = -3.45205253 + -0.5 Combine like terms: -3.45205253 + -0.5 = -3.95205253 x = -3.95205253 Simplifying x = -3.95205253

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.95205253, -3.95205253}

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