5x(x+1)=x+3

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Solution for 5x(x+1)=x+3 equation:


Simplifying
5x(x + 1) = x + 3

Reorder the terms:
5x(1 + x) = x + 3
(1 * 5x + x * 5x) = x + 3
(5x + 5x2) = x + 3

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

Solving
5x + 5x2 = 3 + x

Solving for variable 'x'.

Reorder the terms:
-3 + 5x + -1x + 5x2 = 3 + x + -3 + -1x

Combine like terms: 5x + -1x = 4x
-3 + 4x + 5x2 = 3 + x + -3 + -1x

Reorder the terms:
-3 + 4x + 5x2 = 3 + -3 + x + -1x

Combine like terms: 3 + -3 = 0
-3 + 4x + 5x2 = 0 + x + -1x
-3 + 4x + 5x2 = x + -1x

Combine like terms: x + -1x = 0
-3 + 4x + 5x2 = 0

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

Divide each side by '5'.
-0.6 + 0.8x + x2 = 0

Move the constant term to the right:

Add '0.6' to each side of the equation.
-0.6 + 0.8x + 0.6 + x2 = 0 + 0.6

Reorder the terms:
-0.6 + 0.6 + 0.8x + x2 = 0 + 0.6

Combine like terms: -0.6 + 0.6 = 0.0
0.0 + 0.8x + x2 = 0 + 0.6
0.8x + x2 = 0 + 0.6

Combine like terms: 0 + 0.6 = 0.6
0.8x + x2 = 0.6

The x term is 0.8x.  Take half its coefficient (0.4).
Square it (0.16) and add it to both sides.

Add '0.16' to each side of the equation.
0.8x + 0.16 + x2 = 0.6 + 0.16

Reorder the terms:
0.16 + 0.8x + x2 = 0.6 + 0.16

Combine like terms: 0.6 + 0.16 = 0.76
0.16 + 0.8x + x2 = 0.76

Factor a perfect square on the left side:
(x + 0.4)(x + 0.4) = 0.76

Calculate the square root of the right side: 0.871779789

Break this problem into two subproblems by setting 
(x + 0.4) equal to 0.871779789 and -0.871779789.

Subproblem 1

x + 0.4 = 0.871779789 Simplifying x + 0.4 = 0.871779789 Reorder the terms: 0.4 + x = 0.871779789 Solving 0.4 + x = 0.871779789 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4' to each side of the equation. 0.4 + -0.4 + x = 0.871779789 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + x = 0.871779789 + -0.4 x = 0.871779789 + -0.4 Combine like terms: 0.871779789 + -0.4 = 0.471779789 x = 0.471779789 Simplifying x = 0.471779789

Subproblem 2

x + 0.4 = -0.871779789 Simplifying x + 0.4 = -0.871779789 Reorder the terms: 0.4 + x = -0.871779789 Solving 0.4 + x = -0.871779789 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4' to each side of the equation. 0.4 + -0.4 + x = -0.871779789 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + x = -0.871779789 + -0.4 x = -0.871779789 + -0.4 Combine like terms: -0.871779789 + -0.4 = -1.271779789 x = -1.271779789 Simplifying x = -1.271779789

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.471779789, -1.271779789}

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