x(x+5)=77

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Solution for x(x+5)=77 equation:


Simplifying
x(x + 5) = 77

Reorder the terms:
x(5 + x) = 77
(5 * x + x * x) = 77
(5x + x2) = 77

Solving
5x + x2 = 77

Solving for variable 'x'.

Reorder the terms:
-77 + 5x + x2 = 77 + -77

Combine like terms: 77 + -77 = 0
-77 + 5x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '77' to each side of the equation.
-77 + 5x + 77 + x2 = 0 + 77

Reorder the terms:
-77 + 77 + 5x + x2 = 0 + 77

Combine like terms: -77 + 77 = 0
0 + 5x + x2 = 0 + 77
5x + x2 = 0 + 77

Combine like terms: 0 + 77 = 77
5x + x2 = 77

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 = 77 + 6.25

Reorder the terms:
6.25 + 5x + x2 = 77 + 6.25

Combine like terms: 77 + 6.25 = 83.25
6.25 + 5x + x2 = 83.25

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 83.25

Calculate the square root of the right side: 9.124143795

Break this problem into two subproblems by setting 
(x + 2.5) equal to 9.124143795 and -9.124143795.

Subproblem 1

x + 2.5 = 9.124143795 Simplifying x + 2.5 = 9.124143795 Reorder the terms: 2.5 + x = 9.124143795 Solving 2.5 + x = 9.124143795 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 = 9.124143795 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 9.124143795 + -2.5 x = 9.124143795 + -2.5 Combine like terms: 9.124143795 + -2.5 = 6.624143795 x = 6.624143795 Simplifying x = 6.624143795

Subproblem 2

x + 2.5 = -9.124143795 Simplifying x + 2.5 = -9.124143795 Reorder the terms: 2.5 + x = -9.124143795 Solving 2.5 + x = -9.124143795 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 = -9.124143795 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = -9.124143795 + -2.5 x = -9.124143795 + -2.5 Combine like terms: -9.124143795 + -2.5 = -11.624143795 x = -11.624143795 Simplifying x = -11.624143795

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.624143795, -11.624143795}

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