0.2x-30+x(5+x)=100000

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Solution for 0.2x-30+x(5+x)=100000 equation:


Simplifying
0.2x + -30 + x(5 + x) = 100000
0.2x + -30 + (5 * x + x * x) = 100000
0.2x + -30 + (5x + x2) = 100000

Reorder the terms:
-30 + 0.2x + 5x + x2 = 100000

Combine like terms: 0.2x + 5x = 5.2x
-30 + 5.2x + x2 = 100000

Solving
-30 + 5.2x + x2 = 100000

Solving for variable 'x'.

Reorder the terms:
-30 + -100000 + 5.2x + x2 = 100000 + -100000

Combine like terms: -30 + -100000 = -100030
-100030 + 5.2x + x2 = 100000 + -100000

Combine like terms: 100000 + -100000 = 0
-100030 + 5.2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '100030' to each side of the equation.
-100030 + 5.2x + 100030 + x2 = 0 + 100030

Reorder the terms:
-100030 + 100030 + 5.2x + x2 = 0 + 100030

Combine like terms: -100030 + 100030 = 0
0 + 5.2x + x2 = 0 + 100030
5.2x + x2 = 0 + 100030

Combine like terms: 0 + 100030 = 100030
5.2x + x2 = 100030

The x term is 5.2x.  Take half its coefficient (2.6).
Square it (6.76) and add it to both sides.

Add '6.76' to each side of the equation.
5.2x + 6.76 + x2 = 100030 + 6.76

Reorder the terms:
6.76 + 5.2x + x2 = 100030 + 6.76

Combine like terms: 100030 + 6.76 = 100036.76
6.76 + 5.2x + x2 = 100036.76

Factor a perfect square on the left side:
(x + 2.6)(x + 2.6) = 100036.76

Calculate the square root of the right side: 316.28588334

Break this problem into two subproblems by setting 
(x + 2.6) equal to 316.28588334 and -316.28588334.

Subproblem 1

x + 2.6 = 316.28588334 Simplifying x + 2.6 = 316.28588334 Reorder the terms: 2.6 + x = 316.28588334 Solving 2.6 + x = 316.28588334 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.6' to each side of the equation. 2.6 + -2.6 + x = 316.28588334 + -2.6 Combine like terms: 2.6 + -2.6 = 0.0 0.0 + x = 316.28588334 + -2.6 x = 316.28588334 + -2.6 Combine like terms: 316.28588334 + -2.6 = 313.68588334 x = 313.68588334 Simplifying x = 313.68588334

Subproblem 2

x + 2.6 = -316.28588334 Simplifying x + 2.6 = -316.28588334 Reorder the terms: 2.6 + x = -316.28588334 Solving 2.6 + x = -316.28588334 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.6' to each side of the equation. 2.6 + -2.6 + x = -316.28588334 + -2.6 Combine like terms: 2.6 + -2.6 = 0.0 0.0 + x = -316.28588334 + -2.6 x = -316.28588334 + -2.6 Combine like terms: -316.28588334 + -2.6 = -318.88588334 x = -318.88588334 Simplifying x = -318.88588334

Solution

The solution to the problem is based on the solutions from the subproblems. x = {313.68588334, -318.88588334}

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