7x^2+36x+4=0

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Solution for 7x^2+36x+4=0 equation:


Simplifying
7x2 + 36x + 4 = 0

Reorder the terms:
4 + 36x + 7x2 = 0

Solving
4 + 36x + 7x2 = 0

Solving for variable 'x'.

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

Divide each side by '7'.
0.5714285714 + 5.142857143x + x2 = 0

Move the constant term to the right:

Add '-0.5714285714' to each side of the equation.
0.5714285714 + 5.142857143x + -0.5714285714 + x2 = 0 + -0.5714285714

Reorder the terms:
0.5714285714 + -0.5714285714 + 5.142857143x + x2 = 0 + -0.5714285714

Combine like terms: 0.5714285714 + -0.5714285714 = 0.0000000000
0.0000000000 + 5.142857143x + x2 = 0 + -0.5714285714
5.142857143x + x2 = 0 + -0.5714285714

Combine like terms: 0 + -0.5714285714 = -0.5714285714
5.142857143x + x2 = -0.5714285714

The x term is 5.142857143x.  Take half its coefficient (2.571428572).
Square it (6.612244901) and add it to both sides.

Add '6.612244901' to each side of the equation.
5.142857143x + 6.612244901 + x2 = -0.5714285714 + 6.612244901

Reorder the terms:
6.612244901 + 5.142857143x + x2 = -0.5714285714 + 6.612244901

Combine like terms: -0.5714285714 + 6.612244901 = 6.0408163296
6.612244901 + 5.142857143x + x2 = 6.0408163296

Factor a perfect square on the left side:
(x + 2.571428572)(x + 2.571428572) = 6.0408163296

Calculate the square root of the right side: 2.45780722

Break this problem into two subproblems by setting 
(x + 2.571428572) equal to 2.45780722 and -2.45780722.

Subproblem 1

x + 2.571428572 = 2.45780722 Simplifying x + 2.571428572 = 2.45780722 Reorder the terms: 2.571428572 + x = 2.45780722 Solving 2.571428572 + x = 2.45780722 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.571428572' to each side of the equation. 2.571428572 + -2.571428572 + x = 2.45780722 + -2.571428572 Combine like terms: 2.571428572 + -2.571428572 = 0.000000000 0.000000000 + x = 2.45780722 + -2.571428572 x = 2.45780722 + -2.571428572 Combine like terms: 2.45780722 + -2.571428572 = -0.113621352 x = -0.113621352 Simplifying x = -0.113621352

Subproblem 2

x + 2.571428572 = -2.45780722 Simplifying x + 2.571428572 = -2.45780722 Reorder the terms: 2.571428572 + x = -2.45780722 Solving 2.571428572 + x = -2.45780722 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.571428572' to each side of the equation. 2.571428572 + -2.571428572 + x = -2.45780722 + -2.571428572 Combine like terms: 2.571428572 + -2.571428572 = 0.000000000 0.000000000 + x = -2.45780722 + -2.571428572 x = -2.45780722 + -2.571428572 Combine like terms: -2.45780722 + -2.571428572 = -5.029235792 x = -5.029235792 Simplifying x = -5.029235792

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.113621352, -5.029235792}

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