3*x^2-80x-2700=0

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Solution for 3*x^2-80x-2700=0 equation:


Simplifying
3x2 + -80x + -2700 = 0

Reorder the terms:
-2700 + -80x + 3x2 = 0

Solving
-2700 + -80x + 3x2 = 0

Solving for variable 'x'.

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

Divide each side by '3'.
-900 + -26.66666667x + x2 = 0

Move the constant term to the right:

Add '900' to each side of the equation.
-900 + -26.66666667x + 900 + x2 = 0 + 900

Reorder the terms:
-900 + 900 + -26.66666667x + x2 = 0 + 900

Combine like terms: -900 + 900 = 0
0 + -26.66666667x + x2 = 0 + 900
-26.66666667x + x2 = 0 + 900

Combine like terms: 0 + 900 = 900
-26.66666667x + x2 = 900

The x term is -26.66666667x.  Take half its coefficient (-13.33333334).
Square it (177.7777780) and add it to both sides.

Add '177.7777780' to each side of the equation.
-26.66666667x + 177.7777780 + x2 = 900 + 177.7777780

Reorder the terms:
177.7777780 + -26.66666667x + x2 = 900 + 177.7777780

Combine like terms: 900 + 177.7777780 = 1077.777778
177.7777780 + -26.66666667x + x2 = 1077.777778

Factor a perfect square on the left side:
(x + -13.33333334)(x + -13.33333334) = 1077.777778

Calculate the square root of the right side: 32.829526009

Break this problem into two subproblems by setting 
(x + -13.33333334) equal to 32.829526009 and -32.829526009.

Subproblem 1

x + -13.33333334 = 32.829526009 Simplifying x + -13.33333334 = 32.829526009 Reorder the terms: -13.33333334 + x = 32.829526009 Solving -13.33333334 + x = 32.829526009 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '13.33333334' to each side of the equation. -13.33333334 + 13.33333334 + x = 32.829526009 + 13.33333334 Combine like terms: -13.33333334 + 13.33333334 = 0.00000000 0.00000000 + x = 32.829526009 + 13.33333334 x = 32.829526009 + 13.33333334 Combine like terms: 32.829526009 + 13.33333334 = 46.162859349 x = 46.162859349 Simplifying x = 46.162859349

Subproblem 2

x + -13.33333334 = -32.829526009 Simplifying x + -13.33333334 = -32.829526009 Reorder the terms: -13.33333334 + x = -32.829526009 Solving -13.33333334 + x = -32.829526009 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '13.33333334' to each side of the equation. -13.33333334 + 13.33333334 + x = -32.829526009 + 13.33333334 Combine like terms: -13.33333334 + 13.33333334 = 0.00000000 0.00000000 + x = -32.829526009 + 13.33333334 x = -32.829526009 + 13.33333334 Combine like terms: -32.829526009 + 13.33333334 = -19.496192669 x = -19.496192669 Simplifying x = -19.496192669

Solution

The solution to the problem is based on the solutions from the subproblems. x = {46.162859349, -19.496192669}

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