x^2+54*x-72=0

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Solution for x^2+54*x-72=0 equation:


Simplifying
x2 + 54x + -72 = 0

Reorder the terms:
-72 + 54x + x2 = 0

Solving
-72 + 54x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '72' to each side of the equation.
-72 + 54x + 72 + x2 = 0 + 72

Reorder the terms:
-72 + 72 + 54x + x2 = 0 + 72

Combine like terms: -72 + 72 = 0
0 + 54x + x2 = 0 + 72
54x + x2 = 0 + 72

Combine like terms: 0 + 72 = 72
54x + x2 = 72

The x term is 54x.  Take half its coefficient (27).
Square it (729) and add it to both sides.

Add '729' to each side of the equation.
54x + 729 + x2 = 72 + 729

Reorder the terms:
729 + 54x + x2 = 72 + 729

Combine like terms: 72 + 729 = 801
729 + 54x + x2 = 801

Factor a perfect square on the left side:
(x + 27)(x + 27) = 801

Calculate the square root of the right side: 28.301943396

Break this problem into two subproblems by setting 
(x + 27) equal to 28.301943396 and -28.301943396.

Subproblem 1

x + 27 = 28.301943396 Simplifying x + 27 = 28.301943396 Reorder the terms: 27 + x = 28.301943396 Solving 27 + x = 28.301943396 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-27' to each side of the equation. 27 + -27 + x = 28.301943396 + -27 Combine like terms: 27 + -27 = 0 0 + x = 28.301943396 + -27 x = 28.301943396 + -27 Combine like terms: 28.301943396 + -27 = 1.301943396 x = 1.301943396 Simplifying x = 1.301943396

Subproblem 2

x + 27 = -28.301943396 Simplifying x + 27 = -28.301943396 Reorder the terms: 27 + x = -28.301943396 Solving 27 + x = -28.301943396 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-27' to each side of the equation. 27 + -27 + x = -28.301943396 + -27 Combine like terms: 27 + -27 = 0 0 + x = -28.301943396 + -27 x = -28.301943396 + -27 Combine like terms: -28.301943396 + -27 = -55.301943396 x = -55.301943396 Simplifying x = -55.301943396

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.301943396, -55.301943396}

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