(x+5)*(x+5)=1280

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Solution for (x+5)*(x+5)=1280 equation:


Simplifying
(x + 5)(x + 5) = 1280

Reorder the terms:
(5 + x)(x + 5) = 1280

Reorder the terms:
(5 + x)(5 + x) = 1280

Multiply (5 + x) * (5 + x)
(5(5 + x) + x(5 + x)) = 1280
((5 * 5 + x * 5) + x(5 + x)) = 1280
((25 + 5x) + x(5 + x)) = 1280
(25 + 5x + (5 * x + x * x)) = 1280
(25 + 5x + (5x + x2)) = 1280

Combine like terms: 5x + 5x = 10x
(25 + 10x + x2) = 1280

Solving
25 + 10x + x2 = 1280

Solving for variable 'x'.

Reorder the terms:
25 + -1280 + 10x + x2 = 1280 + -1280

Combine like terms: 25 + -1280 = -1255
-1255 + 10x + x2 = 1280 + -1280

Combine like terms: 1280 + -1280 = 0
-1255 + 10x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '1255' to each side of the equation.
-1255 + 10x + 1255 + x2 = 0 + 1255

Reorder the terms:
-1255 + 1255 + 10x + x2 = 0 + 1255

Combine like terms: -1255 + 1255 = 0
0 + 10x + x2 = 0 + 1255
10x + x2 = 0 + 1255

Combine like terms: 0 + 1255 = 1255
10x + x2 = 1255

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 = 1255 + 25

Reorder the terms:
25 + 10x + x2 = 1255 + 25

Combine like terms: 1255 + 25 = 1280
25 + 10x + x2 = 1280

Factor a perfect square on the left side:
(x + 5)(x + 5) = 1280

Calculate the square root of the right side: 35.77708764

Break this problem into two subproblems by setting 
(x + 5) equal to 35.77708764 and -35.77708764.

Subproblem 1

x + 5 = 35.77708764 Simplifying x + 5 = 35.77708764 Reorder the terms: 5 + x = 35.77708764 Solving 5 + x = 35.77708764 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 = 35.77708764 + -5 Combine like terms: 5 + -5 = 0 0 + x = 35.77708764 + -5 x = 35.77708764 + -5 Combine like terms: 35.77708764 + -5 = 30.77708764 x = 30.77708764 Simplifying x = 30.77708764

Subproblem 2

x + 5 = -35.77708764 Simplifying x + 5 = -35.77708764 Reorder the terms: 5 + x = -35.77708764 Solving 5 + x = -35.77708764 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 = -35.77708764 + -5 Combine like terms: 5 + -5 = 0 0 + x = -35.77708764 + -5 x = -35.77708764 + -5 Combine like terms: -35.77708764 + -5 = -40.77708764 x = -40.77708764 Simplifying x = -40.77708764

Solution

The solution to the problem is based on the solutions from the subproblems. x = {30.77708764, -40.77708764}

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