x^2-24x+84=0

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Solution for x^2-24x+84=0 equation:


Simplifying
x2 + -24x + 84 = 0

Reorder the terms:
84 + -24x + x2 = 0

Solving
84 + -24x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-84' to each side of the equation.
84 + -24x + -84 + x2 = 0 + -84

Reorder the terms:
84 + -84 + -24x + x2 = 0 + -84

Combine like terms: 84 + -84 = 0
0 + -24x + x2 = 0 + -84
-24x + x2 = 0 + -84

Combine like terms: 0 + -84 = -84
-24x + x2 = -84

The x term is -24x.  Take half its coefficient (-12).
Square it (144) and add it to both sides.

Add '144' to each side of the equation.
-24x + 144 + x2 = -84 + 144

Reorder the terms:
144 + -24x + x2 = -84 + 144

Combine like terms: -84 + 144 = 60
144 + -24x + x2 = 60

Factor a perfect square on the left side:
(x + -12)(x + -12) = 60

Calculate the square root of the right side: 7.745966692

Break this problem into two subproblems by setting 
(x + -12) equal to 7.745966692 and -7.745966692.

Subproblem 1

x + -12 = 7.745966692 Simplifying x + -12 = 7.745966692 Reorder the terms: -12 + x = 7.745966692 Solving -12 + x = 7.745966692 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + x = 7.745966692 + 12 Combine like terms: -12 + 12 = 0 0 + x = 7.745966692 + 12 x = 7.745966692 + 12 Combine like terms: 7.745966692 + 12 = 19.745966692 x = 19.745966692 Simplifying x = 19.745966692

Subproblem 2

x + -12 = -7.745966692 Simplifying x + -12 = -7.745966692 Reorder the terms: -12 + x = -7.745966692 Solving -12 + x = -7.745966692 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + x = -7.745966692 + 12 Combine like terms: -12 + 12 = 0 0 + x = -7.745966692 + 12 x = -7.745966692 + 12 Combine like terms: -7.745966692 + 12 = 4.254033308 x = 4.254033308 Simplifying x = 4.254033308

Solution

The solution to the problem is based on the solutions from the subproblems. x = {19.745966692, 4.254033308}

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