.3x^2+54x-12=80

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Solution for .3x^2+54x-12=80 equation:


Simplifying
0.3x2 + 54x + -12 = 80

Reorder the terms:
-12 + 54x + 0.3x2 = 80

Solving
-12 + 54x + 0.3x2 = 80

Solving for variable 'x'.

Reorder the terms:
-12 + -80 + 54x + 0.3x2 = 80 + -80

Combine like terms: -12 + -80 = -92
-92 + 54x + 0.3x2 = 80 + -80

Combine like terms: 80 + -80 = 0
-92 + 54x + 0.3x2 = 0

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

Divide each side by '0.3'.
-306.6666667 + 180x + x2 = 0

Move the constant term to the right:

Add '306.6666667' to each side of the equation.
-306.6666667 + 180x + 306.6666667 + x2 = 0 + 306.6666667

Reorder the terms:
-306.6666667 + 306.6666667 + 180x + x2 = 0 + 306.6666667

Combine like terms: -306.6666667 + 306.6666667 = 0.0000000
0.0000000 + 180x + x2 = 0 + 306.6666667
180x + x2 = 0 + 306.6666667

Combine like terms: 0 + 306.6666667 = 306.6666667
180x + x2 = 306.6666667

The x term is 180x.  Take half its coefficient (90).
Square it (8100) and add it to both sides.

Add '8100' to each side of the equation.
180x + 8100 + x2 = 306.6666667 + 8100

Reorder the terms:
8100 + 180x + x2 = 306.6666667 + 8100

Combine like terms: 306.6666667 + 8100 = 8406.6666667
8100 + 180x + x2 = 8406.6666667

Factor a perfect square on the left side:
(x + 90)(x + 90) = 8406.6666667

Calculate the square root of the right side: 91.687876334

Break this problem into two subproblems by setting 
(x + 90) equal to 91.687876334 and -91.687876334.

Subproblem 1

x + 90 = 91.687876334 Simplifying x + 90 = 91.687876334 Reorder the terms: 90 + x = 91.687876334 Solving 90 + x = 91.687876334 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-90' to each side of the equation. 90 + -90 + x = 91.687876334 + -90 Combine like terms: 90 + -90 = 0 0 + x = 91.687876334 + -90 x = 91.687876334 + -90 Combine like terms: 91.687876334 + -90 = 1.687876334 x = 1.687876334 Simplifying x = 1.687876334

Subproblem 2

x + 90 = -91.687876334 Simplifying x + 90 = -91.687876334 Reorder the terms: 90 + x = -91.687876334 Solving 90 + x = -91.687876334 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-90' to each side of the equation. 90 + -90 + x = -91.687876334 + -90 Combine like terms: 90 + -90 = 0 0 + x = -91.687876334 + -90 x = -91.687876334 + -90 Combine like terms: -91.687876334 + -90 = -181.687876334 x = -181.687876334 Simplifying x = -181.687876334

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.687876334, -181.687876334}

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