x^2+x^2=(x+7)(x+7)

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Solution for x^2+x^2=(x+7)(x+7) equation:


Simplifying
x2 + x2 = (x + 7)(x + 7)

Combine like terms: x2 + x2 = 2x2
2x2 = (x + 7)(x + 7)

Reorder the terms:
2x2 = (7 + x)(x + 7)

Reorder the terms:
2x2 = (7 + x)(7 + x)

Multiply (7 + x) * (7 + x)
2x2 = (7(7 + x) + x(7 + x))
2x2 = ((7 * 7 + x * 7) + x(7 + x))
2x2 = ((49 + 7x) + x(7 + x))
2x2 = (49 + 7x + (7 * x + x * x))
2x2 = (49 + 7x + (7x + x2))

Combine like terms: 7x + 7x = 14x
2x2 = (49 + 14x + x2)

Solving
2x2 = 49 + 14x + x2

Solving for variable 'x'.

Reorder the terms:
-49 + -14x + 2x2 + -1x2 = 49 + 14x + x2 + -49 + -14x + -1x2

Combine like terms: 2x2 + -1x2 = 1x2
-49 + -14x + 1x2 = 49 + 14x + x2 + -49 + -14x + -1x2

Reorder the terms:
-49 + -14x + 1x2 = 49 + -49 + 14x + -14x + x2 + -1x2

Combine like terms: 49 + -49 = 0
-49 + -14x + 1x2 = 0 + 14x + -14x + x2 + -1x2
-49 + -14x + 1x2 = 14x + -14x + x2 + -1x2

Combine like terms: 14x + -14x = 0
-49 + -14x + 1x2 = 0 + x2 + -1x2
-49 + -14x + 1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-49 + -14x + 1x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '49' to each side of the equation.
-49 + -14x + 49 + x2 = 0 + 49

Reorder the terms:
-49 + 49 + -14x + x2 = 0 + 49

Combine like terms: -49 + 49 = 0
0 + -14x + x2 = 0 + 49
-14x + x2 = 0 + 49

Combine like terms: 0 + 49 = 49
-14x + x2 = 49

The x term is -14x.  Take half its coefficient (-7).
Square it (49) and add it to both sides.

Add '49' to each side of the equation.
-14x + 49 + x2 = 49 + 49

Reorder the terms:
49 + -14x + x2 = 49 + 49

Combine like terms: 49 + 49 = 98
49 + -14x + x2 = 98

Factor a perfect square on the left side:
(x + -7)(x + -7) = 98

Calculate the square root of the right side: 9.899494937

Break this problem into two subproblems by setting 
(x + -7) equal to 9.899494937 and -9.899494937.

Subproblem 1

x + -7 = 9.899494937 Simplifying x + -7 = 9.899494937 Reorder the terms: -7 + x = 9.899494937 Solving -7 + x = 9.899494937 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + x = 9.899494937 + 7 Combine like terms: -7 + 7 = 0 0 + x = 9.899494937 + 7 x = 9.899494937 + 7 Combine like terms: 9.899494937 + 7 = 16.899494937 x = 16.899494937 Simplifying x = 16.899494937

Subproblem 2

x + -7 = -9.899494937 Simplifying x + -7 = -9.899494937 Reorder the terms: -7 + x = -9.899494937 Solving -7 + x = -9.899494937 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + x = -9.899494937 + 7 Combine like terms: -7 + 7 = 0 0 + x = -9.899494937 + 7 x = -9.899494937 + 7 Combine like terms: -9.899494937 + 7 = -2.899494937 x = -2.899494937 Simplifying x = -2.899494937

Solution

The solution to the problem is based on the solutions from the subproblems. x = {16.899494937, -2.899494937}

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