0=x^2-90x-25600

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Solution for 0=x^2-90x-25600 equation:


Simplifying
0 = x2 + -90x + -25600

Reorder the terms:
0 = -25600 + -90x + x2

Solving
0 = -25600 + -90x + x2

Solving for variable 'x'.

Combine like terms: 0 + 25600 = 25600
25600 + 90x + -1x2 = -25600 + -90x + x2 + 25600 + 90x + -1x2

Reorder the terms:
25600 + 90x + -1x2 = -25600 + 25600 + -90x + 90x + x2 + -1x2

Combine like terms: -25600 + 25600 = 0
25600 + 90x + -1x2 = 0 + -90x + 90x + x2 + -1x2
25600 + 90x + -1x2 = -90x + 90x + x2 + -1x2

Combine like terms: -90x + 90x = 0
25600 + 90x + -1x2 = 0 + x2 + -1x2
25600 + 90x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
25600 + 90x + -1x2 = 0

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

Divide each side by '-1'.
-25600 + -90x + x2 = 0

Move the constant term to the right:

Add '25600' to each side of the equation.
-25600 + -90x + 25600 + x2 = 0 + 25600

Reorder the terms:
-25600 + 25600 + -90x + x2 = 0 + 25600

Combine like terms: -25600 + 25600 = 0
0 + -90x + x2 = 0 + 25600
-90x + x2 = 0 + 25600

Combine like terms: 0 + 25600 = 25600
-90x + x2 = 25600

The x term is -90x.  Take half its coefficient (-45).
Square it (2025) and add it to both sides.

Add '2025' to each side of the equation.
-90x + 2025 + x2 = 25600 + 2025

Reorder the terms:
2025 + -90x + x2 = 25600 + 2025

Combine like terms: 25600 + 2025 = 27625
2025 + -90x + x2 = 27625

Factor a perfect square on the left side:
(x + -45)(x + -45) = 27625

Calculate the square root of the right side: 166.207701386

Break this problem into two subproblems by setting 
(x + -45) equal to 166.207701386 and -166.207701386.

Subproblem 1

x + -45 = 166.207701386 Simplifying x + -45 = 166.207701386 Reorder the terms: -45 + x = 166.207701386 Solving -45 + x = 166.207701386 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '45' to each side of the equation. -45 + 45 + x = 166.207701386 + 45 Combine like terms: -45 + 45 = 0 0 + x = 166.207701386 + 45 x = 166.207701386 + 45 Combine like terms: 166.207701386 + 45 = 211.207701386 x = 211.207701386 Simplifying x = 211.207701386

Subproblem 2

x + -45 = -166.207701386 Simplifying x + -45 = -166.207701386 Reorder the terms: -45 + x = -166.207701386 Solving -45 + x = -166.207701386 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '45' to each side of the equation. -45 + 45 + x = -166.207701386 + 45 Combine like terms: -45 + 45 = 0 0 + x = -166.207701386 + 45 x = -166.207701386 + 45 Combine like terms: -166.207701386 + 45 = -121.207701386 x = -121.207701386 Simplifying x = -121.207701386

Solution

The solution to the problem is based on the solutions from the subproblems. x = {211.207701386, -121.207701386}

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