0=7x^2-3x-36

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Solution for 0=7x^2-3x-36 equation:


Simplifying
0 = 7x2 + -3x + -36

Reorder the terms:
0 = -36 + -3x + 7x2

Solving
0 = -36 + -3x + 7x2

Solving for variable 'x'.

Combine like terms: 0 + 36 = 36
36 + 3x + -7x2 = -36 + -3x + 7x2 + 36 + 3x + -7x2

Reorder the terms:
36 + 3x + -7x2 = -36 + 36 + -3x + 3x + 7x2 + -7x2

Combine like terms: -36 + 36 = 0
36 + 3x + -7x2 = 0 + -3x + 3x + 7x2 + -7x2
36 + 3x + -7x2 = -3x + 3x + 7x2 + -7x2

Combine like terms: -3x + 3x = 0
36 + 3x + -7x2 = 0 + 7x2 + -7x2
36 + 3x + -7x2 = 7x2 + -7x2

Combine like terms: 7x2 + -7x2 = 0
36 + 3x + -7x2 = 0

Begin completing the square.  Divide all terms by
-7 the coefficient of the squared term: 

Divide each side by '-7'.
-5.142857143 + -0.4285714286x + x2 = 0

Move the constant term to the right:

Add '5.142857143' to each side of the equation.
-5.142857143 + -0.4285714286x + 5.142857143 + x2 = 0 + 5.142857143

Reorder the terms:
-5.142857143 + 5.142857143 + -0.4285714286x + x2 = 0 + 5.142857143

Combine like terms: -5.142857143 + 5.142857143 = 0.000000000
0.000000000 + -0.4285714286x + x2 = 0 + 5.142857143
-0.4285714286x + x2 = 0 + 5.142857143

Combine like terms: 0 + 5.142857143 = 5.142857143
-0.4285714286x + x2 = 5.142857143

The x term is -0.4285714286x.  Take half its coefficient (-0.2142857143).
Square it (0.04591836735) and add it to both sides.

Add '0.04591836735' to each side of the equation.
-0.4285714286x + 0.04591836735 + x2 = 5.142857143 + 0.04591836735

Reorder the terms:
0.04591836735 + -0.4285714286x + x2 = 5.142857143 + 0.04591836735

Combine like terms: 5.142857143 + 0.04591836735 = 5.18877551035
0.04591836735 + -0.4285714286x + x2 = 5.18877551035

Factor a perfect square on the left side:
(x + -0.2142857143)(x + -0.2142857143) = 5.18877551035

Calculate the square root of the right side: 2.277888388

Break this problem into two subproblems by setting 
(x + -0.2142857143) equal to 2.277888388 and -2.277888388.

Subproblem 1

x + -0.2142857143 = 2.277888388 Simplifying x + -0.2142857143 = 2.277888388 Reorder the terms: -0.2142857143 + x = 2.277888388 Solving -0.2142857143 + x = 2.277888388 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2142857143' to each side of the equation. -0.2142857143 + 0.2142857143 + x = 2.277888388 + 0.2142857143 Combine like terms: -0.2142857143 + 0.2142857143 = 0.0000000000 0.0000000000 + x = 2.277888388 + 0.2142857143 x = 2.277888388 + 0.2142857143 Combine like terms: 2.277888388 + 0.2142857143 = 2.4921741023 x = 2.4921741023 Simplifying x = 2.4921741023

Subproblem 2

x + -0.2142857143 = -2.277888388 Simplifying x + -0.2142857143 = -2.277888388 Reorder the terms: -0.2142857143 + x = -2.277888388 Solving -0.2142857143 + x = -2.277888388 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2142857143' to each side of the equation. -0.2142857143 + 0.2142857143 + x = -2.277888388 + 0.2142857143 Combine like terms: -0.2142857143 + 0.2142857143 = 0.0000000000 0.0000000000 + x = -2.277888388 + 0.2142857143 x = -2.277888388 + 0.2142857143 Combine like terms: -2.277888388 + 0.2142857143 = -2.0636026737 x = -2.0636026737 Simplifying x = -2.0636026737

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.4921741023, -2.0636026737}

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