15x^2=2x+3

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Solution for 15x^2=2x+3 equation:


Simplifying
15x2 = 2x + 3

Reorder the terms:
15x2 = 3 + 2x

Solving
15x2 = 3 + 2x

Solving for variable 'x'.

Reorder the terms:
-3 + -2x + 15x2 = 3 + 2x + -3 + -2x

Reorder the terms:
-3 + -2x + 15x2 = 3 + -3 + 2x + -2x

Combine like terms: 3 + -3 = 0
-3 + -2x + 15x2 = 0 + 2x + -2x
-3 + -2x + 15x2 = 2x + -2x

Combine like terms: 2x + -2x = 0
-3 + -2x + 15x2 = 0

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

Divide each side by '15'.
-0.2 + -0.1333333333x + x2 = 0

Move the constant term to the right:

Add '0.2' to each side of the equation.
-0.2 + -0.1333333333x + 0.2 + x2 = 0 + 0.2

Reorder the terms:
-0.2 + 0.2 + -0.1333333333x + x2 = 0 + 0.2

Combine like terms: -0.2 + 0.2 = 0.0
0.0 + -0.1333333333x + x2 = 0 + 0.2
-0.1333333333x + x2 = 0 + 0.2

Combine like terms: 0 + 0.2 = 0.2
-0.1333333333x + x2 = 0.2

The x term is -0.1333333333x.  Take half its coefficient (-0.06666666665).
Square it (0.004444444442) and add it to both sides.

Add '0.004444444442' to each side of the equation.
-0.1333333333x + 0.004444444442 + x2 = 0.2 + 0.004444444442

Reorder the terms:
0.004444444442 + -0.1333333333x + x2 = 0.2 + 0.004444444442

Combine like terms: 0.2 + 0.004444444442 = 0.204444444442
0.004444444442 + -0.1333333333x + x2 = 0.204444444442

Factor a perfect square on the left side:
(x + -0.06666666665)(x + -0.06666666665) = 0.204444444442

Calculate the square root of the right side: 0.452155332

Break this problem into two subproblems by setting 
(x + -0.06666666665) equal to 0.452155332 and -0.452155332.

Subproblem 1

x + -0.06666666665 = 0.452155332 Simplifying x + -0.06666666665 = 0.452155332 Reorder the terms: -0.06666666665 + x = 0.452155332 Solving -0.06666666665 + x = 0.452155332 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.06666666665' to each side of the equation. -0.06666666665 + 0.06666666665 + x = 0.452155332 + 0.06666666665 Combine like terms: -0.06666666665 + 0.06666666665 = 0.00000000000 0.00000000000 + x = 0.452155332 + 0.06666666665 x = 0.452155332 + 0.06666666665 Combine like terms: 0.452155332 + 0.06666666665 = 0.51882199865 x = 0.51882199865 Simplifying x = 0.51882199865

Subproblem 2

x + -0.06666666665 = -0.452155332 Simplifying x + -0.06666666665 = -0.452155332 Reorder the terms: -0.06666666665 + x = -0.452155332 Solving -0.06666666665 + x = -0.452155332 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.06666666665' to each side of the equation. -0.06666666665 + 0.06666666665 + x = -0.452155332 + 0.06666666665 Combine like terms: -0.06666666665 + 0.06666666665 = 0.00000000000 0.00000000000 + x = -0.452155332 + 0.06666666665 x = -0.452155332 + 0.06666666665 Combine like terms: -0.452155332 + 0.06666666665 = -0.38548866535 x = -0.38548866535 Simplifying x = -0.38548866535

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.51882199865, -0.38548866535}

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