0=X^2+10X-900

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Solution for 0=X^2+10X-900 equation:


Simplifying
0 = X2 + 10X + -900

Reorder the terms:
0 = -900 + 10X + X2

Solving
0 = -900 + 10X + X2

Solving for variable 'X'.

Combine like terms: 0 + 900 = 900
900 + -10X + -1X2 = -900 + 10X + X2 + 900 + -10X + -1X2

Reorder the terms:
900 + -10X + -1X2 = -900 + 900 + 10X + -10X + X2 + -1X2

Combine like terms: -900 + 900 = 0
900 + -10X + -1X2 = 0 + 10X + -10X + X2 + -1X2
900 + -10X + -1X2 = 10X + -10X + X2 + -1X2

Combine like terms: 10X + -10X = 0
900 + -10X + -1X2 = 0 + X2 + -1X2
900 + -10X + -1X2 = X2 + -1X2

Combine like terms: X2 + -1X2 = 0
900 + -10X + -1X2 = 0

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

Divide each side by '-1'.
-900 + 10X + X2 = 0

Move the constant term to the right:

Add '900' to each side of the equation.
-900 + 10X + 900 + X2 = 0 + 900

Reorder the terms:
-900 + 900 + 10X + X2 = 0 + 900

Combine like terms: -900 + 900 = 0
0 + 10X + X2 = 0 + 900
10X + X2 = 0 + 900

Combine like terms: 0 + 900 = 900
10X + X2 = 900

The X term is 10X.  Take half its coefficient (5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
10X + 25 + X2 = 900 + 25

Reorder the terms:
25 + 10X + X2 = 900 + 25

Combine like terms: 900 + 25 = 925
25 + 10X + X2 = 925

Factor a perfect square on the left side:
(X + 5)(X + 5) = 925

Calculate the square root of the right side: 30.413812651

Break this problem into two subproblems by setting 
(X + 5) equal to 30.413812651 and -30.413812651.

Subproblem 1

X + 5 = 30.413812651 Simplifying X + 5 = 30.413812651 Reorder the terms: 5 + X = 30.413812651 Solving 5 + X = 30.413812651 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + X = 30.413812651 + -5 Combine like terms: 5 + -5 = 0 0 + X = 30.413812651 + -5 X = 30.413812651 + -5 Combine like terms: 30.413812651 + -5 = 25.413812651 X = 25.413812651 Simplifying X = 25.413812651

Subproblem 2

X + 5 = -30.413812651 Simplifying X + 5 = -30.413812651 Reorder the terms: 5 + X = -30.413812651 Solving 5 + X = -30.413812651 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + X = -30.413812651 + -5 Combine like terms: 5 + -5 = 0 0 + X = -30.413812651 + -5 X = -30.413812651 + -5 Combine like terms: -30.413812651 + -5 = -35.413812651 X = -35.413812651 Simplifying X = -35.413812651

Solution

The solution to the problem is based on the solutions from the subproblems. X = {25.413812651, -35.413812651}

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