x^2+100x=7

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Solution for x^2+100x=7 equation:


Simplifying
x2 + 100x = 7

Reorder the terms:
100x + x2 = 7

Solving
100x + x2 = 7

Solving for variable 'x'.

Reorder the terms:
-7 + 100x + x2 = 7 + -7

Combine like terms: 7 + -7 = 0
-7 + 100x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '7' to each side of the equation.
-7 + 100x + 7 + x2 = 0 + 7

Reorder the terms:
-7 + 7 + 100x + x2 = 0 + 7

Combine like terms: -7 + 7 = 0
0 + 100x + x2 = 0 + 7
100x + x2 = 0 + 7

Combine like terms: 0 + 7 = 7
100x + x2 = 7

The x term is 100x.  Take half its coefficient (50).
Square it (2500) and add it to both sides.

Add '2500' to each side of the equation.
100x + 2500 + x2 = 7 + 2500

Reorder the terms:
2500 + 100x + x2 = 7 + 2500

Combine like terms: 7 + 2500 = 2507
2500 + 100x + x2 = 2507

Factor a perfect square on the left side:
(x + 50)(x + 50) = 2507

Calculate the square root of the right side: 50.069951068

Break this problem into two subproblems by setting 
(x + 50) equal to 50.069951068 and -50.069951068.

Subproblem 1

x + 50 = 50.069951068 Simplifying x + 50 = 50.069951068 Reorder the terms: 50 + x = 50.069951068 Solving 50 + x = 50.069951068 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-50' to each side of the equation. 50 + -50 + x = 50.069951068 + -50 Combine like terms: 50 + -50 = 0 0 + x = 50.069951068 + -50 x = 50.069951068 + -50 Combine like terms: 50.069951068 + -50 = 0.069951068 x = 0.069951068 Simplifying x = 0.069951068

Subproblem 2

x + 50 = -50.069951068 Simplifying x + 50 = -50.069951068 Reorder the terms: 50 + x = -50.069951068 Solving 50 + x = -50.069951068 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-50' to each side of the equation. 50 + -50 + x = -50.069951068 + -50 Combine like terms: 50 + -50 = 0 0 + x = -50.069951068 + -50 x = -50.069951068 + -50 Combine like terms: -50.069951068 + -50 = -100.069951068 x = -100.069951068 Simplifying x = -100.069951068

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.069951068, -100.069951068}

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