(X+5)(X+5)=80

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Solution for (X+5)(X+5)=80 equation:


Simplifying
(X + 5)(X + 5) = 80

Reorder the terms:
(5 + X)(X + 5) = 80

Reorder the terms:
(5 + X)(5 + X) = 80

Multiply (5 + X) * (5 + X)
(5(5 + X) + X(5 + X)) = 80
((5 * 5 + X * 5) + X(5 + X)) = 80
((25 + 5X) + X(5 + X)) = 80
(25 + 5X + (5 * X + X * X)) = 80
(25 + 5X + (5X + X2)) = 80

Combine like terms: 5X + 5X = 10X
(25 + 10X + X2) = 80

Solving
25 + 10X + X2 = 80

Solving for variable 'X'.

Reorder the terms:
25 + -80 + 10X + X2 = 80 + -80

Combine like terms: 25 + -80 = -55
-55 + 10X + X2 = 80 + -80

Combine like terms: 80 + -80 = 0
-55 + 10X + X2 = 0

Begin completing the square.

Move the constant term to the right:

Add '55' to each side of the equation.
-55 + 10X + 55 + X2 = 0 + 55

Reorder the terms:
-55 + 55 + 10X + X2 = 0 + 55

Combine like terms: -55 + 55 = 0
0 + 10X + X2 = 0 + 55
10X + X2 = 0 + 55

Combine like terms: 0 + 55 = 55
10X + X2 = 55

The X term is 10X.  Take half its coefficient (5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
10X + 25 + X2 = 55 + 25

Reorder the terms:
25 + 10X + X2 = 55 + 25

Combine like terms: 55 + 25 = 80
25 + 10X + X2 = 80

Factor a perfect square on the left side:
(X + 5)(X + 5) = 80

Calculate the square root of the right side: 8.94427191

Break this problem into two subproblems by setting 
(X + 5) equal to 8.94427191 and -8.94427191.

Subproblem 1

X + 5 = 8.94427191 Simplifying X + 5 = 8.94427191 Reorder the terms: 5 + X = 8.94427191 Solving 5 + X = 8.94427191 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + X = 8.94427191 + -5 Combine like terms: 5 + -5 = 0 0 + X = 8.94427191 + -5 X = 8.94427191 + -5 Combine like terms: 8.94427191 + -5 = 3.94427191 X = 3.94427191 Simplifying X = 3.94427191

Subproblem 2

X + 5 = -8.94427191 Simplifying X + 5 = -8.94427191 Reorder the terms: 5 + X = -8.94427191 Solving 5 + X = -8.94427191 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + X = -8.94427191 + -5 Combine like terms: 5 + -5 = 0 0 + X = -8.94427191 + -5 X = -8.94427191 + -5 Combine like terms: -8.94427191 + -5 = -13.94427191 X = -13.94427191 Simplifying X = -13.94427191

Solution

The solution to the problem is based on the solutions from the subproblems. X = {3.94427191, -13.94427191}

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