3=5x+3x^2

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Solution for 3=5x+3x^2 equation:


Simplifying
3 = 5x + 3x2

Solving
3 = 5x + 3x2

Solving for variable 'x'.

Reorder the terms:
3 + -5x + -3x2 = 5x + -5x + 3x2 + -3x2

Combine like terms: 5x + -5x = 0
3 + -5x + -3x2 = 0 + 3x2 + -3x2
3 + -5x + -3x2 = 3x2 + -3x2

Combine like terms: 3x2 + -3x2 = 0
3 + -5x + -3x2 = 0

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

Divide each side by '-3'.
-1 + 1.666666667x + x2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + 1.666666667x + 1 + x2 = 0 + 1

Reorder the terms:
-1 + 1 + 1.666666667x + x2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + 1.666666667x + x2 = 0 + 1
1.666666667x + x2 = 0 + 1

Combine like terms: 0 + 1 = 1
1.666666667x + x2 = 1

The x term is 1.666666667x.  Take half its coefficient (0.8333333335).
Square it (0.6944444447) and add it to both sides.

Add '0.6944444447' to each side of the equation.
1.666666667x + 0.6944444447 + x2 = 1 + 0.6944444447

Reorder the terms:
0.6944444447 + 1.666666667x + x2 = 1 + 0.6944444447

Combine like terms: 1 + 0.6944444447 = 1.6944444447
0.6944444447 + 1.666666667x + x2 = 1.6944444447

Factor a perfect square on the left side:
(x + 0.8333333335)(x + 0.8333333335) = 1.6944444447

Calculate the square root of the right side: 1.301708279

Break this problem into two subproblems by setting 
(x + 0.8333333335) equal to 1.301708279 and -1.301708279.

Subproblem 1

x + 0.8333333335 = 1.301708279 Simplifying x + 0.8333333335 = 1.301708279 Reorder the terms: 0.8333333335 + x = 1.301708279 Solving 0.8333333335 + x = 1.301708279 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.8333333335' to each side of the equation. 0.8333333335 + -0.8333333335 + x = 1.301708279 + -0.8333333335 Combine like terms: 0.8333333335 + -0.8333333335 = 0.0000000000 0.0000000000 + x = 1.301708279 + -0.8333333335 x = 1.301708279 + -0.8333333335 Combine like terms: 1.301708279 + -0.8333333335 = 0.4683749455 x = 0.4683749455 Simplifying x = 0.4683749455

Subproblem 2

x + 0.8333333335 = -1.301708279 Simplifying x + 0.8333333335 = -1.301708279 Reorder the terms: 0.8333333335 + x = -1.301708279 Solving 0.8333333335 + x = -1.301708279 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.8333333335' to each side of the equation. 0.8333333335 + -0.8333333335 + x = -1.301708279 + -0.8333333335 Combine like terms: 0.8333333335 + -0.8333333335 = 0.0000000000 0.0000000000 + x = -1.301708279 + -0.8333333335 x = -1.301708279 + -0.8333333335 Combine like terms: -1.301708279 + -0.8333333335 = -2.1350416125 x = -2.1350416125 Simplifying x = -2.1350416125

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.4683749455, -2.1350416125}

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