x^2+x+7=392

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Solution for x^2+x+7=392 equation:


Simplifying
x2 + x + 7 = 392

Reorder the terms:
7 + x + x2 = 392

Solving
7 + x + x2 = 392

Solving for variable 'x'.

Reorder the terms:
7 + -392 + x + x2 = 392 + -392

Combine like terms: 7 + -392 = -385
-385 + x + x2 = 392 + -392

Combine like terms: 392 + -392 = 0
-385 + x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '385' to each side of the equation.
-385 + x + 385 + x2 = 0 + 385

Reorder the terms:
-385 + 385 + x + x2 = 0 + 385

Combine like terms: -385 + 385 = 0
0 + x + x2 = 0 + 385
x + x2 = 0 + 385

Combine like terms: 0 + 385 = 385
x + x2 = 385

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
x + 0.25 + x2 = 385 + 0.25

Reorder the terms:
0.25 + x + x2 = 385 + 0.25

Combine like terms: 385 + 0.25 = 385.25
0.25 + x + x2 = 385.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 385.25

Calculate the square root of the right side: 19.627786426

Break this problem into two subproblems by setting 
(x + 0.5) equal to 19.627786426 and -19.627786426.

Subproblem 1

x + 0.5 = 19.627786426 Simplifying x + 0.5 = 19.627786426 Reorder the terms: 0.5 + x = 19.627786426 Solving 0.5 + x = 19.627786426 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 19.627786426 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 19.627786426 + -0.5 x = 19.627786426 + -0.5 Combine like terms: 19.627786426 + -0.5 = 19.127786426 x = 19.127786426 Simplifying x = 19.127786426

Subproblem 2

x + 0.5 = -19.627786426 Simplifying x + 0.5 = -19.627786426 Reorder the terms: 0.5 + x = -19.627786426 Solving 0.5 + x = -19.627786426 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -19.627786426 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -19.627786426 + -0.5 x = -19.627786426 + -0.5 Combine like terms: -19.627786426 + -0.5 = -20.127786426 x = -20.127786426 Simplifying x = -20.127786426

Solution

The solution to the problem is based on the solutions from the subproblems. x = {19.127786426, -20.127786426}

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