36x^2-84x-49=12

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Solution for 36x^2-84x-49=12 equation:


Simplifying
36x2 + -84x + -49 = 12

Reorder the terms:
-49 + -84x + 36x2 = 12

Solving
-49 + -84x + 36x2 = 12

Solving for variable 'x'.

Reorder the terms:
-49 + -12 + -84x + 36x2 = 12 + -12

Combine like terms: -49 + -12 = -61
-61 + -84x + 36x2 = 12 + -12

Combine like terms: 12 + -12 = 0
-61 + -84x + 36x2 = 0

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

Divide each side by '36'.
-1.694444444 + -2.333333333x + x2 = 0

Move the constant term to the right:

Add '1.694444444' to each side of the equation.
-1.694444444 + -2.333333333x + 1.694444444 + x2 = 0 + 1.694444444

Reorder the terms:
-1.694444444 + 1.694444444 + -2.333333333x + x2 = 0 + 1.694444444

Combine like terms: -1.694444444 + 1.694444444 = 0.000000000
0.000000000 + -2.333333333x + x2 = 0 + 1.694444444
-2.333333333x + x2 = 0 + 1.694444444

Combine like terms: 0 + 1.694444444 = 1.694444444
-2.333333333x + x2 = 1.694444444

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 = 1.694444444 + 1.361111112

Reorder the terms:
1.361111112 + -2.333333333x + x2 = 1.694444444 + 1.361111112

Combine like terms: 1.694444444 + 1.361111112 = 3.055555556
1.361111112 + -2.333333333x + x2 = 3.055555556

Factor a perfect square on the left side:
(x + -1.166666667)(x + -1.166666667) = 3.055555556

Calculate the square root of the right side: 1.748014747

Break this problem into two subproblems by setting 
(x + -1.166666667) equal to 1.748014747 and -1.748014747.

Subproblem 1

x + -1.166666667 = 1.748014747 Simplifying x + -1.166666667 = 1.748014747 Reorder the terms: -1.166666667 + x = 1.748014747 Solving -1.166666667 + x = 1.748014747 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 = 1.748014747 + 1.166666667 Combine like terms: -1.166666667 + 1.166666667 = 0.000000000 0.000000000 + x = 1.748014747 + 1.166666667 x = 1.748014747 + 1.166666667 Combine like terms: 1.748014747 + 1.166666667 = 2.914681414 x = 2.914681414 Simplifying x = 2.914681414

Subproblem 2

x + -1.166666667 = -1.748014747 Simplifying x + -1.166666667 = -1.748014747 Reorder the terms: -1.166666667 + x = -1.748014747 Solving -1.166666667 + x = -1.748014747 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 = -1.748014747 + 1.166666667 Combine like terms: -1.166666667 + 1.166666667 = 0.000000000 0.000000000 + x = -1.748014747 + 1.166666667 x = -1.748014747 + 1.166666667 Combine like terms: -1.748014747 + 1.166666667 = -0.58134808 x = -0.58134808 Simplifying x = -0.58134808

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.914681414, -0.58134808}

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