8x^2-15x-24=0

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Solution for 8x^2-15x-24=0 equation:


Simplifying
8x2 + -15x + -24 = 0

Reorder the terms:
-24 + -15x + 8x2 = 0

Solving
-24 + -15x + 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'.
-3 + -1.875x + x2 = 0

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + -1.875x + 3 + x2 = 0 + 3

Reorder the terms:
-3 + 3 + -1.875x + x2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + -1.875x + x2 = 0 + 3
-1.875x + x2 = 0 + 3

Combine like terms: 0 + 3 = 3
-1.875x + x2 = 3

The x term is -1.875x.  Take half its coefficient (-0.9375).
Square it (0.87890625) and add it to both sides.

Add '0.87890625' to each side of the equation.
-1.875x + 0.87890625 + x2 = 3 + 0.87890625

Reorder the terms:
0.87890625 + -1.875x + x2 = 3 + 0.87890625

Combine like terms: 3 + 0.87890625 = 3.87890625
0.87890625 + -1.875x + x2 = 3.87890625

Factor a perfect square on the left side:
(x + -0.9375)(x + -0.9375) = 3.87890625

Calculate the square root of the right side: 1.969493907

Break this problem into two subproblems by setting 
(x + -0.9375) equal to 1.969493907 and -1.969493907.

Subproblem 1

x + -0.9375 = 1.969493907 Simplifying x + -0.9375 = 1.969493907 Reorder the terms: -0.9375 + x = 1.969493907 Solving -0.9375 + x = 1.969493907 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.9375' to each side of the equation. -0.9375 + 0.9375 + x = 1.969493907 + 0.9375 Combine like terms: -0.9375 + 0.9375 = 0.0000 0.0000 + x = 1.969493907 + 0.9375 x = 1.969493907 + 0.9375 Combine like terms: 1.969493907 + 0.9375 = 2.906993907 x = 2.906993907 Simplifying x = 2.906993907

Subproblem 2

x + -0.9375 = -1.969493907 Simplifying x + -0.9375 = -1.969493907 Reorder the terms: -0.9375 + x = -1.969493907 Solving -0.9375 + x = -1.969493907 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.9375' to each side of the equation. -0.9375 + 0.9375 + x = -1.969493907 + 0.9375 Combine like terms: -0.9375 + 0.9375 = 0.0000 0.0000 + x = -1.969493907 + 0.9375 x = -1.969493907 + 0.9375 Combine like terms: -1.969493907 + 0.9375 = -1.031993907 x = -1.031993907 Simplifying x = -1.031993907

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.906993907, -1.031993907}

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