x(x+7)=88

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Solution for x(x+7)=88 equation:


Simplifying
x(x + 7) = 88

Reorder the terms:
x(7 + x) = 88
(7 * x + x * x) = 88
(7x + x2) = 88

Solving
7x + x2 = 88

Solving for variable 'x'.

Reorder the terms:
-88 + 7x + x2 = 88 + -88

Combine like terms: 88 + -88 = 0
-88 + 7x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '88' to each side of the equation.
-88 + 7x + 88 + x2 = 0 + 88

Reorder the terms:
-88 + 88 + 7x + x2 = 0 + 88

Combine like terms: -88 + 88 = 0
0 + 7x + x2 = 0 + 88
7x + x2 = 0 + 88

Combine like terms: 0 + 88 = 88
7x + x2 = 88

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 = 88 + 12.25

Reorder the terms:
12.25 + 7x + x2 = 88 + 12.25

Combine like terms: 88 + 12.25 = 100.25
12.25 + 7x + x2 = 100.25

Factor a perfect square on the left side:
(x + 3.5)(x + 3.5) = 100.25

Calculate the square root of the right side: 10.012492197

Break this problem into two subproblems by setting 
(x + 3.5) equal to 10.012492197 and -10.012492197.

Subproblem 1

x + 3.5 = 10.012492197 Simplifying x + 3.5 = 10.012492197 Reorder the terms: 3.5 + x = 10.012492197 Solving 3.5 + x = 10.012492197 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 = 10.012492197 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = 10.012492197 + -3.5 x = 10.012492197 + -3.5 Combine like terms: 10.012492197 + -3.5 = 6.512492197 x = 6.512492197 Simplifying x = 6.512492197

Subproblem 2

x + 3.5 = -10.012492197 Simplifying x + 3.5 = -10.012492197 Reorder the terms: 3.5 + x = -10.012492197 Solving 3.5 + x = -10.012492197 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 = -10.012492197 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = -10.012492197 + -3.5 x = -10.012492197 + -3.5 Combine like terms: -10.012492197 + -3.5 = -13.512492197 x = -13.512492197 Simplifying x = -13.512492197

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.512492197, -13.512492197}

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