0=(x^2)+(90x)-36

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Solution for 0=(x^2)+(90x)-36 equation:


Simplifying
0 = (x2) + (90x) + -36
0 = x2 + (90x) + -36

Reorder the terms:
0 = -36 + (90x) + x2

Solving
0 = -36 + (90x) + x2

Solving for variable 'x'.

Combine like terms: 0 + 36 = 36
36 + (-90x) + -1x2 = -36 + (90x) + x2 + 36 + (-90x) + -1x2

Reorder the terms:
36 + (-90x) + -1x2 = -36 + 36 + (90x) + (-90x) + x2 + -1x2

Combine like terms: -36 + 36 = 0
36 + (-90x) + -1x2 = 0 + (90x) + (-90x) + x2 + -1x2
36 + (-90x) + -1x2 = (90x) + (-90x) + x2 + -1x2

Combine like terms: (90x) + (-90x) = 0
36 + (-90x) + -1x2 = 0 + x2 + -1x2
36 + (-90x) + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
36 + (-90x) + -1x2 = 0

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

Divide each side by '-1'.
-36 + (90x) + x2 = 0

Move the constant term to the right:

Add '36' to each side of the equation.
-36 + (90x) + 36 + x2 = 0 + 36

Reorder the terms:
-36 + 36 + (90x) + x2 = 0 + 36

Combine like terms: -36 + 36 = 0
0 + (90x) + x2 = 0 + 36
(90x) + x2 = 0 + 36

Combine like terms: 0 + 36 = 36
(90x) + x2 = 36

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 = 36 + 2025

Reorder the terms:
2025 + (90x) + x2 = 36 + 2025

Combine like terms: 36 + 2025 = 2061
2025 + (90x) + x2 = 2061

Factor a perfect square on the left side:
(x + 45)(x + 45) = 2061

Calculate the square root of the right side: 45.398237851

Break this problem into two subproblems by setting 
(x + 45) equal to 45.398237851 and -45.398237851.

Subproblem 1

x + 45 = 45.398237851 Simplifying x + 45 = 45.398237851 Reorder the terms: 45 + x = 45.398237851 Solving 45 + x = 45.398237851 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 = 45.398237851 + -45 Combine like terms: 45 + -45 = 0 0 + x = 45.398237851 + -45 x = 45.398237851 + -45 Combine like terms: 45.398237851 + -45 = 0.398237851 x = 0.398237851 Simplifying x = 0.398237851

Subproblem 2

x + 45 = -45.398237851 Simplifying x + 45 = -45.398237851 Reorder the terms: 45 + x = -45.398237851 Solving 45 + x = -45.398237851 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 = -45.398237851 + -45 Combine like terms: 45 + -45 = 0 0 + x = -45.398237851 + -45 x = -45.398237851 + -45 Combine like terms: -45.398237851 + -45 = -90.398237851 x = -90.398237851 Simplifying x = -90.398237851

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.398237851, -90.398237851}

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