x=4x^2-24x-72

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Solution for x=4x^2-24x-72 equation:


Simplifying
x = 4x2 + -24x + -72

Reorder the terms:
x = -72 + -24x + 4x2

Solving
x = -72 + -24x + 4x2

Solving for variable 'x'.

Reorder the terms:
72 + x + 24x + -4x2 = -72 + -24x + 4x2 + 72 + 24x + -4x2

Combine like terms: x + 24x = 25x
72 + 25x + -4x2 = -72 + -24x + 4x2 + 72 + 24x + -4x2

Reorder the terms:
72 + 25x + -4x2 = -72 + 72 + -24x + 24x + 4x2 + -4x2

Combine like terms: -72 + 72 = 0
72 + 25x + -4x2 = 0 + -24x + 24x + 4x2 + -4x2
72 + 25x + -4x2 = -24x + 24x + 4x2 + -4x2

Combine like terms: -24x + 24x = 0
72 + 25x + -4x2 = 0 + 4x2 + -4x2
72 + 25x + -4x2 = 4x2 + -4x2

Combine like terms: 4x2 + -4x2 = 0
72 + 25x + -4x2 = 0

Begin completing the square.  Divide all terms by
-4 the coefficient of the squared term: 

Divide each side by '-4'.
-18 + -6.25x + x2 = 0

Move the constant term to the right:

Add '18' to each side of the equation.
-18 + -6.25x + 18 + x2 = 0 + 18

Reorder the terms:
-18 + 18 + -6.25x + x2 = 0 + 18

Combine like terms: -18 + 18 = 0
0 + -6.25x + x2 = 0 + 18
-6.25x + x2 = 0 + 18

Combine like terms: 0 + 18 = 18
-6.25x + x2 = 18

The x term is -6.25x.  Take half its coefficient (-3.125).
Square it (9.765625) and add it to both sides.

Add '9.765625' to each side of the equation.
-6.25x + 9.765625 + x2 = 18 + 9.765625

Reorder the terms:
9.765625 + -6.25x + x2 = 18 + 9.765625

Combine like terms: 18 + 9.765625 = 27.765625
9.765625 + -6.25x + x2 = 27.765625

Factor a perfect square on the left side:
(x + -3.125)(x + -3.125) = 27.765625

Calculate the square root of the right side: 5.269309727

Break this problem into two subproblems by setting 
(x + -3.125) equal to 5.269309727 and -5.269309727.

Subproblem 1

x + -3.125 = 5.269309727 Simplifying x + -3.125 = 5.269309727 Reorder the terms: -3.125 + x = 5.269309727 Solving -3.125 + x = 5.269309727 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.125' to each side of the equation. -3.125 + 3.125 + x = 5.269309727 + 3.125 Combine like terms: -3.125 + 3.125 = 0.000 0.000 + x = 5.269309727 + 3.125 x = 5.269309727 + 3.125 Combine like terms: 5.269309727 + 3.125 = 8.394309727 x = 8.394309727 Simplifying x = 8.394309727

Subproblem 2

x + -3.125 = -5.269309727 Simplifying x + -3.125 = -5.269309727 Reorder the terms: -3.125 + x = -5.269309727 Solving -3.125 + x = -5.269309727 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.125' to each side of the equation. -3.125 + 3.125 + x = -5.269309727 + 3.125 Combine like terms: -3.125 + 3.125 = 0.000 0.000 + x = -5.269309727 + 3.125 x = -5.269309727 + 3.125 Combine like terms: -5.269309727 + 3.125 = -2.144309727 x = -2.144309727 Simplifying x = -2.144309727

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.394309727, -2.144309727}

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