x^2-5*4x=180

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Solution for x^2-5*4x=180 equation:


Simplifying
x2 + -5 * 4x = 180

Multiply -5 * 4
x2 + -20x = 180

Reorder the terms:
-20x + x2 = 180

Solving
-20x + x2 = 180

Solving for variable 'x'.

Reorder the terms:
-180 + -20x + x2 = 180 + -180

Combine like terms: 180 + -180 = 0
-180 + -20x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '180' to each side of the equation.
-180 + -20x + 180 + x2 = 0 + 180

Reorder the terms:
-180 + 180 + -20x + x2 = 0 + 180

Combine like terms: -180 + 180 = 0
0 + -20x + x2 = 0 + 180
-20x + x2 = 0 + 180

Combine like terms: 0 + 180 = 180
-20x + x2 = 180

The x term is -20x.  Take half its coefficient (-10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
-20x + 100 + x2 = 180 + 100

Reorder the terms:
100 + -20x + x2 = 180 + 100

Combine like terms: 180 + 100 = 280
100 + -20x + x2 = 280

Factor a perfect square on the left side:
(x + -10)(x + -10) = 280

Calculate the square root of the right side: 16.733200531

Break this problem into two subproblems by setting 
(x + -10) equal to 16.733200531 and -16.733200531.

Subproblem 1

x + -10 = 16.733200531 Simplifying x + -10 = 16.733200531 Reorder the terms: -10 + x = 16.733200531 Solving -10 + x = 16.733200531 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + x = 16.733200531 + 10 Combine like terms: -10 + 10 = 0 0 + x = 16.733200531 + 10 x = 16.733200531 + 10 Combine like terms: 16.733200531 + 10 = 26.733200531 x = 26.733200531 Simplifying x = 26.733200531

Subproblem 2

x + -10 = -16.733200531 Simplifying x + -10 = -16.733200531 Reorder the terms: -10 + x = -16.733200531 Solving -10 + x = -16.733200531 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + x = -16.733200531 + 10 Combine like terms: -10 + 10 = 0 0 + x = -16.733200531 + 10 x = -16.733200531 + 10 Combine like terms: -16.733200531 + 10 = -6.733200531 x = -6.733200531 Simplifying x = -6.733200531

Solution

The solution to the problem is based on the solutions from the subproblems. x = {26.733200531, -6.733200531}

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