2x^2+3x-100=0

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


Simplifying
2x2 + 3x + -100 = 0

Reorder the terms:
-100 + 3x + 2x2 = 0

Solving
-100 + 3x + 2x2 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
-50 + 1.5x + x2 = 0

Move the constant term to the right:

Add '50' to each side of the equation.
-50 + 1.5x + 50 + x2 = 0 + 50

Reorder the terms:
-50 + 50 + 1.5x + x2 = 0 + 50

Combine like terms: -50 + 50 = 0
0 + 1.5x + x2 = 0 + 50
1.5x + x2 = 0 + 50

Combine like terms: 0 + 50 = 50
1.5x + x2 = 50

The x term is 1.5x.  Take half its coefficient (0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
1.5x + 0.5625 + x2 = 50 + 0.5625

Reorder the terms:
0.5625 + 1.5x + x2 = 50 + 0.5625

Combine like terms: 50 + 0.5625 = 50.5625
0.5625 + 1.5x + x2 = 50.5625

Factor a perfect square on the left side:
(x + 0.75)(x + 0.75) = 50.5625

Calculate the square root of the right side: 7.110731327

Break this problem into two subproblems by setting 
(x + 0.75) equal to 7.110731327 and -7.110731327.

Subproblem 1

x + 0.75 = 7.110731327 Simplifying x + 0.75 = 7.110731327 Reorder the terms: 0.75 + x = 7.110731327 Solving 0.75 + x = 7.110731327 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = 7.110731327 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = 7.110731327 + -0.75 x = 7.110731327 + -0.75 Combine like terms: 7.110731327 + -0.75 = 6.360731327 x = 6.360731327 Simplifying x = 6.360731327

Subproblem 2

x + 0.75 = -7.110731327 Simplifying x + 0.75 = -7.110731327 Reorder the terms: 0.75 + x = -7.110731327 Solving 0.75 + x = -7.110731327 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = -7.110731327 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = -7.110731327 + -0.75 x = -7.110731327 + -0.75 Combine like terms: -7.110731327 + -0.75 = -7.860731327 x = -7.860731327 Simplifying x = -7.860731327

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.360731327, -7.860731327}

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