-5x^2+25x+100=0

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Solution for -5x^2+25x+100=0 equation: 


Simplifying
-5x2 + 25x + 100 = 0

Reorder the terms:
100 + 25x + -5x2 = 0

Solving
100 + 25x + -5x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '5'.
5(20 + 5x + -1x2) = 0

Ignore the factor 5.

Subproblem 1
Set the factor '(20 + 5x + -1x2)' equal to zero and attempt to solve:

Simplifying
20 + 5x + -1x2 = 0

Solving
20 + 5x + -1x2 = 0

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

Divide each side by '-1'.
-20 + -5x + x2 = 0

Move the constant term to the right:

Add '20' to each side of the equation.
-20 + -5x + 20 + x2 = 0 + 20

Reorder the terms:
-20 + 20 + -5x + x2 = 0 + 20

Combine like terms: -20 + 20 = 0
0 + -5x + x2 = 0 + 20
-5x + x2 = 0 + 20

Combine like terms: 0 + 20 = 20
-5x + x2 = 20

The x term is -5x.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5x + 6.25 + x2 = 20 + 6.25

Reorder the terms:
6.25 + -5x + x2 = 20 + 6.25

Combine like terms: 20 + 6.25 = 26.25
6.25 + -5x + x2 = 26.25

Factor a perfect square on the left side:
(x + -2.5)(x + -2.5) = 26.25

Calculate the square root of the right side: 5.123475383

Break this problem into two subproblems by setting 
(x + -2.5) equal to 5.123475383 and -5.123475383.


Subproblem 1
x + -2.5 = 5.123475383

Simplifying
x + -2.5 = 5.123475383

Reorder the terms:
-2.5 + x = 5.123475383

Solving
-2.5 + x = 5.123475383

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '2.5' to each side of the equation.
-2.5 + 2.5 + x = 5.123475383 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + x = 5.123475383 + 2.5
x = 5.123475383 + 2.5

Combine like terms: 5.123475383 + 2.5 = 7.623475383
x = 7.623475383

Simplifying
x = 7.623475383


Subproblem 2
x + -2.5 = -5.123475383

Simplifying
x + -2.5 = -5.123475383

Reorder the terms:
-2.5 + x = -5.123475383

Solving
-2.5 + x = -5.123475383

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '2.5' to each side of the equation.
-2.5 + 2.5 + x = -5.123475383 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + x = -5.123475383 + 2.5
x = -5.123475383 + 2.5

Combine like terms: -5.123475383 + 2.5 = -2.623475383
x = -2.623475383

Simplifying
x = -2.623475383


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {7.623475383, -2.623475383}
Solution
x = {7.623475383, -2.623475383}

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