4x(x+5)=7x+38

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Solution for 4x(x+5)=7x+38 equation:


Simplifying
4x(x + 5) = 7x + 38

Reorder the terms:
4x(5 + x) = 7x + 38
(5 * 4x + x * 4x) = 7x + 38
(20x + 4x2) = 7x + 38

Reorder the terms:
20x + 4x2 = 38 + 7x

Solving
20x + 4x2 = 38 + 7x

Solving for variable 'x'.

Reorder the terms:
-38 + 20x + -7x + 4x2 = 38 + 7x + -38 + -7x

Combine like terms: 20x + -7x = 13x
-38 + 13x + 4x2 = 38 + 7x + -38 + -7x

Reorder the terms:
-38 + 13x + 4x2 = 38 + -38 + 7x + -7x

Combine like terms: 38 + -38 = 0
-38 + 13x + 4x2 = 0 + 7x + -7x
-38 + 13x + 4x2 = 7x + -7x

Combine like terms: 7x + -7x = 0
-38 + 13x + 4x2 = 0

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

Divide each side by '4'.
-9.5 + 3.25x + x2 = 0

Move the constant term to the right:

Add '9.5' to each side of the equation.
-9.5 + 3.25x + 9.5 + x2 = 0 + 9.5

Reorder the terms:
-9.5 + 9.5 + 3.25x + x2 = 0 + 9.5

Combine like terms: -9.5 + 9.5 = 0.0
0.0 + 3.25x + x2 = 0 + 9.5
3.25x + x2 = 0 + 9.5

Combine like terms: 0 + 9.5 = 9.5
3.25x + x2 = 9.5

The x term is 3.25x.  Take half its coefficient (1.625).
Square it (2.640625) and add it to both sides.

Add '2.640625' to each side of the equation.
3.25x + 2.640625 + x2 = 9.5 + 2.640625

Reorder the terms:
2.640625 + 3.25x + x2 = 9.5 + 2.640625

Combine like terms: 9.5 + 2.640625 = 12.140625
2.640625 + 3.25x + x2 = 12.140625

Factor a perfect square on the left side:
(x + 1.625)(x + 1.625) = 12.140625

Calculate the square root of the right side: 3.484339966

Break this problem into two subproblems by setting 
(x + 1.625) equal to 3.484339966 and -3.484339966.

Subproblem 1

x + 1.625 = 3.484339966 Simplifying x + 1.625 = 3.484339966 Reorder the terms: 1.625 + x = 3.484339966 Solving 1.625 + x = 3.484339966 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.625' to each side of the equation. 1.625 + -1.625 + x = 3.484339966 + -1.625 Combine like terms: 1.625 + -1.625 = 0.000 0.000 + x = 3.484339966 + -1.625 x = 3.484339966 + -1.625 Combine like terms: 3.484339966 + -1.625 = 1.859339966 x = 1.859339966 Simplifying x = 1.859339966

Subproblem 2

x + 1.625 = -3.484339966 Simplifying x + 1.625 = -3.484339966 Reorder the terms: 1.625 + x = -3.484339966 Solving 1.625 + x = -3.484339966 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.625' to each side of the equation. 1.625 + -1.625 + x = -3.484339966 + -1.625 Combine like terms: 1.625 + -1.625 = 0.000 0.000 + x = -3.484339966 + -1.625 x = -3.484339966 + -1.625 Combine like terms: -3.484339966 + -1.625 = -5.109339966 x = -5.109339966 Simplifying x = -5.109339966

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.859339966, -5.109339966}

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