8x^2-59x-21=0

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Solution for 8x^2-59x-21=0 equation:


Simplifying
8x2 + -59x + -21 = 0

Reorder the terms:
-21 + -59x + 8x2 = 0

Solving
-21 + -59x + 8x2 = 0

Solving for variable 'x'.

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

Divide each side by '8'.
-2.625 + -7.375x + x2 = 0

Move the constant term to the right:

Add '2.625' to each side of the equation.
-2.625 + -7.375x + 2.625 + x2 = 0 + 2.625

Reorder the terms:
-2.625 + 2.625 + -7.375x + x2 = 0 + 2.625

Combine like terms: -2.625 + 2.625 = 0.000
0.000 + -7.375x + x2 = 0 + 2.625
-7.375x + x2 = 0 + 2.625

Combine like terms: 0 + 2.625 = 2.625
-7.375x + x2 = 2.625

The x term is -7.375x.  Take half its coefficient (-3.6875).
Square it (13.59765625) and add it to both sides.

Add '13.59765625' to each side of the equation.
-7.375x + 13.59765625 + x2 = 2.625 + 13.59765625

Reorder the terms:
13.59765625 + -7.375x + x2 = 2.625 + 13.59765625

Combine like terms: 2.625 + 13.59765625 = 16.22265625
13.59765625 + -7.375x + x2 = 16.22265625

Factor a perfect square on the left side:
(x + -3.6875)(x + -3.6875) = 16.22265625

Calculate the square root of the right side: 4.027735871

Break this problem into two subproblems by setting 
(x + -3.6875) equal to 4.027735871 and -4.027735871.

Subproblem 1

x + -3.6875 = 4.027735871 Simplifying x + -3.6875 = 4.027735871 Reorder the terms: -3.6875 + x = 4.027735871 Solving -3.6875 + x = 4.027735871 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.6875' to each side of the equation. -3.6875 + 3.6875 + x = 4.027735871 + 3.6875 Combine like terms: -3.6875 + 3.6875 = 0.0000 0.0000 + x = 4.027735871 + 3.6875 x = 4.027735871 + 3.6875 Combine like terms: 4.027735871 + 3.6875 = 7.715235871 x = 7.715235871 Simplifying x = 7.715235871

Subproblem 2

x + -3.6875 = -4.027735871 Simplifying x + -3.6875 = -4.027735871 Reorder the terms: -3.6875 + x = -4.027735871 Solving -3.6875 + x = -4.027735871 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.6875' to each side of the equation. -3.6875 + 3.6875 + x = -4.027735871 + 3.6875 Combine like terms: -3.6875 + 3.6875 = 0.0000 0.0000 + x = -4.027735871 + 3.6875 x = -4.027735871 + 3.6875 Combine like terms: -4.027735871 + 3.6875 = -0.340235871 x = -0.340235871 Simplifying x = -0.340235871

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.715235871, -0.340235871}

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