36x^2-84x=49

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Solution for 36x^2-84x=49 equation:


Simplifying
36x2 + -84x = 49

Reorder the terms:
-84x + 36x2 = 49

Solving
-84x + 36x2 = 49

Solving for variable 'x'.

Reorder the terms:
-49 + -84x + 36x2 = 49 + -49

Combine like terms: 49 + -49 = 0
-49 + -84x + 36x2 = 0

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

Divide each side by '36'.
-1.361111111 + -2.333333333x + x2 = 0

Move the constant term to the right:

Add '1.361111111' to each side of the equation.
-1.361111111 + -2.333333333x + 1.361111111 + x2 = 0 + 1.361111111

Reorder the terms:
-1.361111111 + 1.361111111 + -2.333333333x + x2 = 0 + 1.361111111

Combine like terms: -1.361111111 + 1.361111111 = 0.000000000
0.000000000 + -2.333333333x + x2 = 0 + 1.361111111
-2.333333333x + x2 = 0 + 1.361111111

Combine like terms: 0 + 1.361111111 = 1.361111111
-2.333333333x + x2 = 1.361111111

The x term is -2.333333333x.  Take half its coefficient (-1.166666667).
Square it (1.361111112) and add it to both sides.

Add '1.361111112' to each side of the equation.
-2.333333333x + 1.361111112 + x2 = 1.361111111 + 1.361111112

Reorder the terms:
1.361111112 + -2.333333333x + x2 = 1.361111111 + 1.361111112

Combine like terms: 1.361111111 + 1.361111112 = 2.722222223
1.361111112 + -2.333333333x + x2 = 2.722222223

Factor a perfect square on the left side:
(x + -1.166666667)(x + -1.166666667) = 2.722222223

Calculate the square root of the right side: 1.649915823

Break this problem into two subproblems by setting 
(x + -1.166666667) equal to 1.649915823 and -1.649915823.

Subproblem 1

x + -1.166666667 = 1.649915823 Simplifying x + -1.166666667 = 1.649915823 Reorder the terms: -1.166666667 + x = 1.649915823 Solving -1.166666667 + x = 1.649915823 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.166666667' to each side of the equation. -1.166666667 + 1.166666667 + x = 1.649915823 + 1.166666667 Combine like terms: -1.166666667 + 1.166666667 = 0.000000000 0.000000000 + x = 1.649915823 + 1.166666667 x = 1.649915823 + 1.166666667 Combine like terms: 1.649915823 + 1.166666667 = 2.81658249 x = 2.81658249 Simplifying x = 2.81658249

Subproblem 2

x + -1.166666667 = -1.649915823 Simplifying x + -1.166666667 = -1.649915823 Reorder the terms: -1.166666667 + x = -1.649915823 Solving -1.166666667 + x = -1.649915823 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.166666667' to each side of the equation. -1.166666667 + 1.166666667 + x = -1.649915823 + 1.166666667 Combine like terms: -1.166666667 + 1.166666667 = 0.000000000 0.000000000 + x = -1.649915823 + 1.166666667 x = -1.649915823 + 1.166666667 Combine like terms: -1.649915823 + 1.166666667 = -0.483249156 x = -0.483249156 Simplifying x = -0.483249156

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.81658249, -0.483249156}

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