3x^2-5x=36

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Solution for 3x^2-5x=36 equation:


Simplifying
3x2 + -5x = 36

Reorder the terms:
-5x + 3x2 = 36

Solving
-5x + 3x2 = 36

Solving for variable 'x'.

Reorder the terms:
-36 + -5x + 3x2 = 36 + -36

Combine like terms: 36 + -36 = 0
-36 + -5x + 3x2 = 0

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

Divide each side by '3'.
-12 + -1.666666667x + x2 = 0

Move the constant term to the right:

Add '12' to each side of the equation.
-12 + -1.666666667x + 12 + x2 = 0 + 12

Reorder the terms:
-12 + 12 + -1.666666667x + x2 = 0 + 12

Combine like terms: -12 + 12 = 0
0 + -1.666666667x + x2 = 0 + 12
-1.666666667x + x2 = 0 + 12

Combine like terms: 0 + 12 = 12
-1.666666667x + x2 = 12

The x term is -1.666666667x.  Take half its coefficient (-0.8333333335).
Square it (0.6944444447) and add it to both sides.

Add '0.6944444447' to each side of the equation.
-1.666666667x + 0.6944444447 + x2 = 12 + 0.6944444447

Reorder the terms:
0.6944444447 + -1.666666667x + x2 = 12 + 0.6944444447

Combine like terms: 12 + 0.6944444447 = 12.6944444447
0.6944444447 + -1.666666667x + x2 = 12.6944444447

Factor a perfect square on the left side:
(x + -0.8333333335)(x + -0.8333333335) = 12.6944444447

Calculate the square root of the right side: 3.562926388

Break this problem into two subproblems by setting 
(x + -0.8333333335) equal to 3.562926388 and -3.562926388.

Subproblem 1

x + -0.8333333335 = 3.562926388 Simplifying x + -0.8333333335 = 3.562926388 Reorder the terms: -0.8333333335 + x = 3.562926388 Solving -0.8333333335 + x = 3.562926388 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.8333333335' to each side of the equation. -0.8333333335 + 0.8333333335 + x = 3.562926388 + 0.8333333335 Combine like terms: -0.8333333335 + 0.8333333335 = 0.0000000000 0.0000000000 + x = 3.562926388 + 0.8333333335 x = 3.562926388 + 0.8333333335 Combine like terms: 3.562926388 + 0.8333333335 = 4.3962597215 x = 4.3962597215 Simplifying x = 4.3962597215

Subproblem 2

x + -0.8333333335 = -3.562926388 Simplifying x + -0.8333333335 = -3.562926388 Reorder the terms: -0.8333333335 + x = -3.562926388 Solving -0.8333333335 + x = -3.562926388 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.8333333335' to each side of the equation. -0.8333333335 + 0.8333333335 + x = -3.562926388 + 0.8333333335 Combine like terms: -0.8333333335 + 0.8333333335 = 0.0000000000 0.0000000000 + x = -3.562926388 + 0.8333333335 x = -3.562926388 + 0.8333333335 Combine like terms: -3.562926388 + 0.8333333335 = -2.7295930545 x = -2.7295930545 Simplifying x = -2.7295930545

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.3962597215, -2.7295930545}

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