(x+7)(x)=50

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Solution for (x+7)(x)=50 equation:


Simplifying
(x + 7)(x) = 50

Reorder the terms:
(7 + x)(x) = 50

Reorder the terms for easier multiplication:
x(7 + x) = 50
(7 * x + x * x) = 50
(7x + x2) = 50

Solving
7x + x2 = 50

Solving for variable 'x'.

Reorder the terms:
-50 + 7x + x2 = 50 + -50

Combine like terms: 50 + -50 = 0
-50 + 7x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '50' to each side of the equation.
-50 + 7x + 50 + x2 = 0 + 50

Reorder the terms:
-50 + 50 + 7x + x2 = 0 + 50

Combine like terms: -50 + 50 = 0
0 + 7x + x2 = 0 + 50
7x + x2 = 0 + 50

Combine like terms: 0 + 50 = 50
7x + x2 = 50

The x term is 7x.  Take half its coefficient (3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
7x + 12.25 + x2 = 50 + 12.25

Reorder the terms:
12.25 + 7x + x2 = 50 + 12.25

Combine like terms: 50 + 12.25 = 62.25
12.25 + 7x + x2 = 62.25

Factor a perfect square on the left side:
(x + 3.5)(x + 3.5) = 62.25

Calculate the square root of the right side: 7.889866919

Break this problem into two subproblems by setting 
(x + 3.5) equal to 7.889866919 and -7.889866919.

Subproblem 1

x + 3.5 = 7.889866919 Simplifying x + 3.5 = 7.889866919 Reorder the terms: 3.5 + x = 7.889866919 Solving 3.5 + x = 7.889866919 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = 7.889866919 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = 7.889866919 + -3.5 x = 7.889866919 + -3.5 Combine like terms: 7.889866919 + -3.5 = 4.389866919 x = 4.389866919 Simplifying x = 4.389866919

Subproblem 2

x + 3.5 = -7.889866919 Simplifying x + 3.5 = -7.889866919 Reorder the terms: 3.5 + x = -7.889866919 Solving 3.5 + x = -7.889866919 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = -7.889866919 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = -7.889866919 + -3.5 x = -7.889866919 + -3.5 Combine like terms: -7.889866919 + -3.5 = -11.389866919 x = -11.389866919 Simplifying x = -11.389866919

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.389866919, -11.389866919}

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