x^2-6x+21=180

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Solution for x^2-6x+21=180 equation:


Simplifying
x2 + -6x + 21 = 180

Reorder the terms:
21 + -6x + x2 = 180

Solving
21 + -6x + x2 = 180

Solving for variable 'x'.

Reorder the terms:
21 + -180 + -6x + x2 = 180 + -180

Combine like terms: 21 + -180 = -159
-159 + -6x + x2 = 180 + -180

Combine like terms: 180 + -180 = 0
-159 + -6x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '159' to each side of the equation.
-159 + -6x + 159 + x2 = 0 + 159

Reorder the terms:
-159 + 159 + -6x + x2 = 0 + 159

Combine like terms: -159 + 159 = 0
0 + -6x + x2 = 0 + 159
-6x + x2 = 0 + 159

Combine like terms: 0 + 159 = 159
-6x + x2 = 159

The x term is -6x.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6x + 9 + x2 = 159 + 9

Reorder the terms:
9 + -6x + x2 = 159 + 9

Combine like terms: 159 + 9 = 168
9 + -6x + x2 = 168

Factor a perfect square on the left side:
(x + -3)(x + -3) = 168

Calculate the square root of the right side: 12.961481397

Break this problem into two subproblems by setting 
(x + -3) equal to 12.961481397 and -12.961481397.

Subproblem 1

x + -3 = 12.961481397 Simplifying x + -3 = 12.961481397 Reorder the terms: -3 + x = 12.961481397 Solving -3 + x = 12.961481397 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = 12.961481397 + 3 Combine like terms: -3 + 3 = 0 0 + x = 12.961481397 + 3 x = 12.961481397 + 3 Combine like terms: 12.961481397 + 3 = 15.961481397 x = 15.961481397 Simplifying x = 15.961481397

Subproblem 2

x + -3 = -12.961481397 Simplifying x + -3 = -12.961481397 Reorder the terms: -3 + x = -12.961481397 Solving -3 + x = -12.961481397 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = -12.961481397 + 3 Combine like terms: -3 + 3 = 0 0 + x = -12.961481397 + 3 x = -12.961481397 + 3 Combine like terms: -12.961481397 + 3 = -9.961481397 x = -9.961481397 Simplifying x = -9.961481397

Solution

The solution to the problem is based on the solutions from the subproblems. x = {15.961481397, -9.961481397}

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