7*x+x^2-208=0

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Solution for 7*x+x^2-208=0 equation:


Simplifying
7x + x2 + -208 = 0

Reorder the terms:
-208 + 7x + x2 = 0

Solving
-208 + 7x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '208' to each side of the equation.
-208 + 7x + 208 + x2 = 0 + 208

Reorder the terms:
-208 + 208 + 7x + x2 = 0 + 208

Combine like terms: -208 + 208 = 0
0 + 7x + x2 = 0 + 208
7x + x2 = 0 + 208

Combine like terms: 0 + 208 = 208
7x + x2 = 208

The x term is 7x.  Take half its coefficient (3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
7x + 12.25 + x2 = 208 + 12.25

Reorder the terms:
12.25 + 7x + x2 = 208 + 12.25

Combine like terms: 208 + 12.25 = 220.25
12.25 + 7x + x2 = 220.25

Factor a perfect square on the left side:
(x + 3.5)(x + 3.5) = 220.25

Calculate the square root of the right side: 14.84082208

Break this problem into two subproblems by setting 
(x + 3.5) equal to 14.84082208 and -14.84082208.

Subproblem 1

x + 3.5 = 14.84082208 Simplifying x + 3.5 = 14.84082208 Reorder the terms: 3.5 + x = 14.84082208 Solving 3.5 + x = 14.84082208 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = 14.84082208 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = 14.84082208 + -3.5 x = 14.84082208 + -3.5 Combine like terms: 14.84082208 + -3.5 = 11.34082208 x = 11.34082208 Simplifying x = 11.34082208

Subproblem 2

x + 3.5 = -14.84082208 Simplifying x + 3.5 = -14.84082208 Reorder the terms: 3.5 + x = -14.84082208 Solving 3.5 + x = -14.84082208 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = -14.84082208 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = -14.84082208 + -3.5 x = -14.84082208 + -3.5 Combine like terms: -14.84082208 + -3.5 = -18.34082208 x = -18.34082208 Simplifying x = -18.34082208

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.34082208, -18.34082208}

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