4x^2+4x-100.5=0

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Solution for 4x^2+4x-100.5=0 equation:


Simplifying
4x2 + 4x + -100.5 = 0

Reorder the terms:
-100.5 + 4x + 4x2 = 0

Solving
-100.5 + 4x + 4x2 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
-25.125 + x + x2 = 0

Move the constant term to the right:

Add '25.125' to each side of the equation.
-25.125 + x + 25.125 + x2 = 0 + 25.125

Reorder the terms:
-25.125 + 25.125 + x + x2 = 0 + 25.125

Combine like terms: -25.125 + 25.125 = 0.000
0.000 + x + x2 = 0 + 25.125
x + x2 = 0 + 25.125

Combine like terms: 0 + 25.125 = 25.125
x + x2 = 25.125

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.
 + 0.25 + x2 = 25.125 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x2 = 25.125 + 0.25

Combine like terms: 25.125 + 0.25 = 25.375
1.25 + x2 = 25.375

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 25.375

Calculate the square root of the right side: 5.03736042

Break this problem into two subproblems by setting 
(x + 0.5) equal to 5.03736042 and -5.03736042.

Subproblem 1

x + 0.5 = 5.03736042 Simplifying x + 0.5 = 5.03736042 Reorder the terms: 0.5 + x = 5.03736042 Solving 0.5 + x = 5.03736042 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 = 5.03736042 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 5.03736042 + -0.5 x = 5.03736042 + -0.5 Combine like terms: 5.03736042 + -0.5 = 4.53736042 x = 4.53736042 Simplifying x = 4.53736042

Subproblem 2

x + 0.5 = -5.03736042 Simplifying x + 0.5 = -5.03736042 Reorder the terms: 0.5 + x = -5.03736042 Solving 0.5 + x = -5.03736042 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 = -5.03736042 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -5.03736042 + -0.5 x = -5.03736042 + -0.5 Combine like terms: -5.03736042 + -0.5 = -5.53736042 x = -5.53736042 Simplifying x = -5.53736042

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.53736042, -5.53736042}

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