5x^2-71x-282=0

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Solution for 5x^2-71x-282=0 equation:


Simplifying
5x2 + -71x + -282 = 0

Reorder the terms:
-282 + -71x + 5x2 = 0

Solving
-282 + -71x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
-56.4 + -14.2x + x2 = 0

Move the constant term to the right:

Add '56.4' to each side of the equation.
-56.4 + -14.2x + 56.4 + x2 = 0 + 56.4

Reorder the terms:
-56.4 + 56.4 + -14.2x + x2 = 0 + 56.4

Combine like terms: -56.4 + 56.4 = 0.0
0.0 + -14.2x + x2 = 0 + 56.4
-14.2x + x2 = 0 + 56.4

Combine like terms: 0 + 56.4 = 56.4
-14.2x + x2 = 56.4

The x term is -14.2x.  Take half its coefficient (-7.1).
Square it (50.41) and add it to both sides.

Add '50.41' to each side of the equation.
-14.2x + 50.41 + x2 = 56.4 + 50.41

Reorder the terms:
50.41 + -14.2x + x2 = 56.4 + 50.41

Combine like terms: 56.4 + 50.41 = 106.81
50.41 + -14.2x + x2 = 106.81

Factor a perfect square on the left side:
(x + -7.1)(x + -7.1) = 106.81

Calculate the square root of the right side: 10.334892356

Break this problem into two subproblems by setting 
(x + -7.1) equal to 10.334892356 and -10.334892356.

Subproblem 1

x + -7.1 = 10.334892356 Simplifying x + -7.1 = 10.334892356 Reorder the terms: -7.1 + x = 10.334892356 Solving -7.1 + x = 10.334892356 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7.1' to each side of the equation. -7.1 + 7.1 + x = 10.334892356 + 7.1 Combine like terms: -7.1 + 7.1 = 0.0 0.0 + x = 10.334892356 + 7.1 x = 10.334892356 + 7.1 Combine like terms: 10.334892356 + 7.1 = 17.434892356 x = 17.434892356 Simplifying x = 17.434892356

Subproblem 2

x + -7.1 = -10.334892356 Simplifying x + -7.1 = -10.334892356 Reorder the terms: -7.1 + x = -10.334892356 Solving -7.1 + x = -10.334892356 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7.1' to each side of the equation. -7.1 + 7.1 + x = -10.334892356 + 7.1 Combine like terms: -7.1 + 7.1 = 0.0 0.0 + x = -10.334892356 + 7.1 x = -10.334892356 + 7.1 Combine like terms: -10.334892356 + 7.1 = -3.234892356 x = -3.234892356 Simplifying x = -3.234892356

Solution

The solution to the problem is based on the solutions from the subproblems. x = {17.434892356, -3.234892356}

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