0=x^2+3x-100

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Solution for 0=x^2+3x-100 equation:


Simplifying
0 = x2 + 3x + -100

Reorder the terms:
0 = -100 + 3x + x2

Solving
0 = -100 + 3x + x2

Solving for variable 'x'.

Combine like terms: 0 + 100 = 100
100 + -3x + -1x2 = -100 + 3x + x2 + 100 + -3x + -1x2

Reorder the terms:
100 + -3x + -1x2 = -100 + 100 + 3x + -3x + x2 + -1x2

Combine like terms: -100 + 100 = 0
100 + -3x + -1x2 = 0 + 3x + -3x + x2 + -1x2
100 + -3x + -1x2 = 3x + -3x + x2 + -1x2

Combine like terms: 3x + -3x = 0
100 + -3x + -1x2 = 0 + x2 + -1x2
100 + -3x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
100 + -3x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-100 + 3x + x2 = 0

Move the constant term to the right:

Add '100' to each side of the equation.
-100 + 3x + 100 + x2 = 0 + 100

Reorder the terms:
-100 + 100 + 3x + x2 = 0 + 100

Combine like terms: -100 + 100 = 0
0 + 3x + x2 = 0 + 100
3x + x2 = 0 + 100

Combine like terms: 0 + 100 = 100
3x + x2 = 100

The x term is 3x.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3x + 2.25 + x2 = 100 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 100 + 2.25

Combine like terms: 100 + 2.25 = 102.25
2.25 + 3x + x2 = 102.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 102.25

Calculate the square root of the right side: 10.111874208

Break this problem into two subproblems by setting 
(x + 1.5) equal to 10.111874208 and -10.111874208.

Subproblem 1

x + 1.5 = 10.111874208 Simplifying x + 1.5 = 10.111874208 Reorder the terms: 1.5 + x = 10.111874208 Solving 1.5 + x = 10.111874208 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = 10.111874208 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 10.111874208 + -1.5 x = 10.111874208 + -1.5 Combine like terms: 10.111874208 + -1.5 = 8.611874208 x = 8.611874208 Simplifying x = 8.611874208

Subproblem 2

x + 1.5 = -10.111874208 Simplifying x + 1.5 = -10.111874208 Reorder the terms: 1.5 + x = -10.111874208 Solving 1.5 + x = -10.111874208 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = -10.111874208 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -10.111874208 + -1.5 x = -10.111874208 + -1.5 Combine like terms: -10.111874208 + -1.5 = -11.611874208 x = -11.611874208 Simplifying x = -11.611874208

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.611874208, -11.611874208}

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