(x+5)(x)=43

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Solution for (x+5)(x)=43 equation:


Simplifying
(x + 5)(x) = 43

Reorder the terms:
(5 + x)(x) = 43

Reorder the terms for easier multiplication:
x(5 + x) = 43
(5 * x + x * x) = 43
(5x + x2) = 43

Solving
5x + x2 = 43

Solving for variable 'x'.

Reorder the terms:
-43 + 5x + x2 = 43 + -43

Combine like terms: 43 + -43 = 0
-43 + 5x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '43' to each side of the equation.
-43 + 5x + 43 + x2 = 0 + 43

Reorder the terms:
-43 + 43 + 5x + x2 = 0 + 43

Combine like terms: -43 + 43 = 0
0 + 5x + x2 = 0 + 43
5x + x2 = 0 + 43

Combine like terms: 0 + 43 = 43
5x + x2 = 43

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 = 43 + 6.25

Reorder the terms:
6.25 + 5x + x2 = 43 + 6.25

Combine like terms: 43 + 6.25 = 49.25
6.25 + 5x + x2 = 49.25

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 49.25

Calculate the square root of the right side: 7.017834424

Break this problem into two subproblems by setting 
(x + 2.5) equal to 7.017834424 and -7.017834424.

Subproblem 1

x + 2.5 = 7.017834424 Simplifying x + 2.5 = 7.017834424 Reorder the terms: 2.5 + x = 7.017834424 Solving 2.5 + x = 7.017834424 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 = 7.017834424 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 7.017834424 + -2.5 x = 7.017834424 + -2.5 Combine like terms: 7.017834424 + -2.5 = 4.517834424 x = 4.517834424 Simplifying x = 4.517834424

Subproblem 2

x + 2.5 = -7.017834424 Simplifying x + 2.5 = -7.017834424 Reorder the terms: 2.5 + x = -7.017834424 Solving 2.5 + x = -7.017834424 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 = -7.017834424 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = -7.017834424 + -2.5 x = -7.017834424 + -2.5 Combine like terms: -7.017834424 + -2.5 = -9.517834424 x = -9.517834424 Simplifying x = -9.517834424

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.517834424, -9.517834424}

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