(x+5)x=42

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Solution for (x+5)x=42 equation:


Simplifying
(x + 5) * x = 42

Reorder the terms:
(5 + x) * x = 42

Reorder the terms for easier multiplication:
x(5 + x) = 42
(5 * x + x * x) = 42
(5x + x2) = 42

Solving
5x + x2 = 42

Solving for variable 'x'.

Reorder the terms:
-42 + 5x + x2 = 42 + -42

Combine like terms: 42 + -42 = 0
-42 + 5x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '42' to each side of the equation.
-42 + 5x + 42 + x2 = 0 + 42

Reorder the terms:
-42 + 42 + 5x + x2 = 0 + 42

Combine like terms: -42 + 42 = 0
0 + 5x + x2 = 0 + 42
5x + x2 = 0 + 42

Combine like terms: 0 + 42 = 42
5x + x2 = 42

The x term is 5x.  Take half its coefficient (2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
5x + 6.25 + x2 = 42 + 6.25

Reorder the terms:
6.25 + 5x + x2 = 42 + 6.25

Combine like terms: 42 + 6.25 = 48.25
6.25 + 5x + x2 = 48.25

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 48.25

Calculate the square root of the right side: 6.946221995

Break this problem into two subproblems by setting 
(x + 2.5) equal to 6.946221995 and -6.946221995.

Subproblem 1

x + 2.5 = 6.946221995 Simplifying x + 2.5 = 6.946221995 Reorder the terms: 2.5 + x = 6.946221995 Solving 2.5 + x = 6.946221995 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = 6.946221995 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 6.946221995 + -2.5 x = 6.946221995 + -2.5 Combine like terms: 6.946221995 + -2.5 = 4.446221995 x = 4.446221995 Simplifying x = 4.446221995

Subproblem 2

x + 2.5 = -6.946221995 Simplifying x + 2.5 = -6.946221995 Reorder the terms: 2.5 + x = -6.946221995 Solving 2.5 + x = -6.946221995 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = -6.946221995 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = -6.946221995 + -2.5 x = -6.946221995 + -2.5 Combine like terms: -6.946221995 + -2.5 = -9.446221995 x = -9.446221995 Simplifying x = -9.446221995

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.446221995, -9.446221995}

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