x^2+(2x)2=625

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Solution for x^2+(2x)2=625 equation:


Simplifying
x2 + (2x) * 2 = 625

Remove parenthesis around (2x)
x2 + 2x * 2 = 625

Reorder the terms for easier multiplication:
x2 + 2 * 2x = 625

Multiply 2 * 2
x2 + 4x = 625

Reorder the terms:
4x + x2 = 625

Solving
4x + x2 = 625

Solving for variable 'x'.

Reorder the terms:
-625 + 4x + x2 = 625 + -625

Combine like terms: 625 + -625 = 0
-625 + 4x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '625' to each side of the equation.
-625 + 4x + 625 + x2 = 0 + 625

Reorder the terms:
-625 + 625 + 4x + x2 = 0 + 625

Combine like terms: -625 + 625 = 0
0 + 4x + x2 = 0 + 625
4x + x2 = 0 + 625

Combine like terms: 0 + 625 = 625
4x + x2 = 625

The x term is 4x.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4x + 4 + x2 = 625 + 4

Reorder the terms:
4 + 4x + x2 = 625 + 4

Combine like terms: 625 + 4 = 629
4 + 4x + x2 = 629

Factor a perfect square on the left side:
(x + 2)(x + 2) = 629

Calculate the square root of the right side: 25.079872408

Break this problem into two subproblems by setting 
(x + 2) equal to 25.079872408 and -25.079872408.

Subproblem 1

x + 2 = 25.079872408 Simplifying x + 2 = 25.079872408 Reorder the terms: 2 + x = 25.079872408 Solving 2 + x = 25.079872408 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 25.079872408 + -2 Combine like terms: 2 + -2 = 0 0 + x = 25.079872408 + -2 x = 25.079872408 + -2 Combine like terms: 25.079872408 + -2 = 23.079872408 x = 23.079872408 Simplifying x = 23.079872408

Subproblem 2

x + 2 = -25.079872408 Simplifying x + 2 = -25.079872408 Reorder the terms: 2 + x = -25.079872408 Solving 2 + x = -25.079872408 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = -25.079872408 + -2 Combine like terms: 2 + -2 = 0 0 + x = -25.079872408 + -2 x = -25.079872408 + -2 Combine like terms: -25.079872408 + -2 = -27.079872408 x = -27.079872408 Simplifying x = -27.079872408

Solution

The solution to the problem is based on the solutions from the subproblems. x = {23.079872408, -27.079872408}

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