2x^2-7x-64=0

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Solution for 2x^2-7x-64=0 equation:


Simplifying
2x2 + -7x + -64 = 0

Reorder the terms:
-64 + -7x + 2x2 = 0

Solving
-64 + -7x + 2x2 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
-32 + -3.5x + x2 = 0

Move the constant term to the right:

Add '32' to each side of the equation.
-32 + -3.5x + 32 + x2 = 0 + 32

Reorder the terms:
-32 + 32 + -3.5x + x2 = 0 + 32

Combine like terms: -32 + 32 = 0
0 + -3.5x + x2 = 0 + 32
-3.5x + x2 = 0 + 32

Combine like terms: 0 + 32 = 32
-3.5x + x2 = 32

The x term is -3.5x.  Take half its coefficient (-1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
-3.5x + 3.0625 + x2 = 32 + 3.0625

Reorder the terms:
3.0625 + -3.5x + x2 = 32 + 3.0625

Combine like terms: 32 + 3.0625 = 35.0625
3.0625 + -3.5x + x2 = 35.0625

Factor a perfect square on the left side:
(x + -1.75)(x + -1.75) = 35.0625

Calculate the square root of the right side: 5.921359641

Break this problem into two subproblems by setting 
(x + -1.75) equal to 5.921359641 and -5.921359641.

Subproblem 1

x + -1.75 = 5.921359641 Simplifying x + -1.75 = 5.921359641 Reorder the terms: -1.75 + x = 5.921359641 Solving -1.75 + x = 5.921359641 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + x = 5.921359641 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x = 5.921359641 + 1.75 x = 5.921359641 + 1.75 Combine like terms: 5.921359641 + 1.75 = 7.671359641 x = 7.671359641 Simplifying x = 7.671359641

Subproblem 2

x + -1.75 = -5.921359641 Simplifying x + -1.75 = -5.921359641 Reorder the terms: -1.75 + x = -5.921359641 Solving -1.75 + x = -5.921359641 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + x = -5.921359641 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x = -5.921359641 + 1.75 x = -5.921359641 + 1.75 Combine like terms: -5.921359641 + 1.75 = -4.171359641 x = -4.171359641 Simplifying x = -4.171359641

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.671359641, -4.171359641}

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