7x^2-61x-36=0

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Solution for 7x^2-61x-36=0 equation:


Simplifying
7x2 + -61x + -36 = 0

Reorder the terms:
-36 + -61x + 7x2 = 0

Solving
-36 + -61x + 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'.
-5.142857143 + -8.714285714x + x2 = 0

Move the constant term to the right:

Add '5.142857143' to each side of the equation.
-5.142857143 + -8.714285714x + 5.142857143 + x2 = 0 + 5.142857143

Reorder the terms:
-5.142857143 + 5.142857143 + -8.714285714x + x2 = 0 + 5.142857143

Combine like terms: -5.142857143 + 5.142857143 = 0.000000000
0.000000000 + -8.714285714x + x2 = 0 + 5.142857143
-8.714285714x + x2 = 0 + 5.142857143

Combine like terms: 0 + 5.142857143 = 5.142857143
-8.714285714x + x2 = 5.142857143

The x term is -8.714285714x.  Take half its coefficient (-4.357142857).
Square it (18.98469388) and add it to both sides.

Add '18.98469388' to each side of the equation.
-8.714285714x + 18.98469388 + x2 = 5.142857143 + 18.98469388

Reorder the terms:
18.98469388 + -8.714285714x + x2 = 5.142857143 + 18.98469388

Combine like terms: 5.142857143 + 18.98469388 = 24.127551023
18.98469388 + -8.714285714x + x2 = 24.127551023

Factor a perfect square on the left side:
(x + -4.357142857)(x + -4.357142857) = 24.127551023

Calculate the square root of the right side: 4.911980357

Break this problem into two subproblems by setting 
(x + -4.357142857) equal to 4.911980357 and -4.911980357.

Subproblem 1

x + -4.357142857 = 4.911980357 Simplifying x + -4.357142857 = 4.911980357 Reorder the terms: -4.357142857 + x = 4.911980357 Solving -4.357142857 + x = 4.911980357 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.357142857' to each side of the equation. -4.357142857 + 4.357142857 + x = 4.911980357 + 4.357142857 Combine like terms: -4.357142857 + 4.357142857 = 0.000000000 0.000000000 + x = 4.911980357 + 4.357142857 x = 4.911980357 + 4.357142857 Combine like terms: 4.911980357 + 4.357142857 = 9.269123214 x = 9.269123214 Simplifying x = 9.269123214

Subproblem 2

x + -4.357142857 = -4.911980357 Simplifying x + -4.357142857 = -4.911980357 Reorder the terms: -4.357142857 + x = -4.911980357 Solving -4.357142857 + x = -4.911980357 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.357142857' to each side of the equation. -4.357142857 + 4.357142857 + x = -4.911980357 + 4.357142857 Combine like terms: -4.357142857 + 4.357142857 = 0.000000000 0.000000000 + x = -4.911980357 + 4.357142857 x = -4.911980357 + 4.357142857 Combine like terms: -4.911980357 + 4.357142857 = -0.5548375 x = -0.5548375 Simplifying x = -0.5548375

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.269123214, -0.5548375}

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