4x(x+1)=3+7x

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Solution for 4x(x+1)=3+7x equation:


Simplifying
4x(x + 1) = 3 + 7x

Reorder the terms:
4x(1 + x) = 3 + 7x
(1 * 4x + x * 4x) = 3 + 7x
(4x + 4x2) = 3 + 7x

Solving
4x + 4x2 = 3 + 7x

Solving for variable 'x'.

Reorder the terms:
-3 + 4x + -7x + 4x2 = 3 + 7x + -3 + -7x

Combine like terms: 4x + -7x = -3x
-3 + -3x + 4x2 = 3 + 7x + -3 + -7x

Reorder the terms:
-3 + -3x + 4x2 = 3 + -3 + 7x + -7x

Combine like terms: 3 + -3 = 0
-3 + -3x + 4x2 = 0 + 7x + -7x
-3 + -3x + 4x2 = 7x + -7x

Combine like terms: 7x + -7x = 0
-3 + -3x + 4x2 = 0

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

Divide each side by '4'.
-0.75 + -0.75x + x2 = 0

Move the constant term to the right:

Add '0.75' to each side of the equation.
-0.75 + -0.75x + 0.75 + x2 = 0 + 0.75

Reorder the terms:
-0.75 + 0.75 + -0.75x + x2 = 0 + 0.75

Combine like terms: -0.75 + 0.75 = 0.00
0.00 + -0.75x + x2 = 0 + 0.75
-0.75x + x2 = 0 + 0.75

Combine like terms: 0 + 0.75 = 0.75
-0.75x + x2 = 0.75

The x term is -0.75x.  Take half its coefficient (-0.375).
Square it (0.140625) and add it to both sides.

Add '0.140625' to each side of the equation.
-0.75x + 0.140625 + x2 = 0.75 + 0.140625

Reorder the terms:
0.140625 + -0.75x + x2 = 0.75 + 0.140625

Combine like terms: 0.75 + 0.140625 = 0.890625
0.140625 + -0.75x + x2 = 0.890625

Factor a perfect square on the left side:
(x + -0.375)(x + -0.375) = 0.890625

Calculate the square root of the right side: 0.943729304

Break this problem into two subproblems by setting 
(x + -0.375) equal to 0.943729304 and -0.943729304.

Subproblem 1

x + -0.375 = 0.943729304 Simplifying x + -0.375 = 0.943729304 Reorder the terms: -0.375 + x = 0.943729304 Solving -0.375 + x = 0.943729304 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.375' to each side of the equation. -0.375 + 0.375 + x = 0.943729304 + 0.375 Combine like terms: -0.375 + 0.375 = 0.000 0.000 + x = 0.943729304 + 0.375 x = 0.943729304 + 0.375 Combine like terms: 0.943729304 + 0.375 = 1.318729304 x = 1.318729304 Simplifying x = 1.318729304

Subproblem 2

x + -0.375 = -0.943729304 Simplifying x + -0.375 = -0.943729304 Reorder the terms: -0.375 + x = -0.943729304 Solving -0.375 + x = -0.943729304 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.375' to each side of the equation. -0.375 + 0.375 + x = -0.943729304 + 0.375 Combine like terms: -0.375 + 0.375 = 0.000 0.000 + x = -0.943729304 + 0.375 x = -0.943729304 + 0.375 Combine like terms: -0.943729304 + 0.375 = -0.568729304 x = -0.568729304 Simplifying x = -0.568729304

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.318729304, -0.568729304}

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