8x^2-22x-15=0

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Solution for 8x^2-22x-15=0 equation:


Simplifying
8x2 + -22x + -15 = 0

Reorder the terms:
-15 + -22x + 8x2 = 0

Solving
-15 + -22x + 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'.
-1.875 + -2.75x + x2 = 0

Move the constant term to the right:

Add '1.875' to each side of the equation.
-1.875 + -2.75x + 1.875 + x2 = 0 + 1.875

Reorder the terms:
-1.875 + 1.875 + -2.75x + x2 = 0 + 1.875

Combine like terms: -1.875 + 1.875 = 0.000
0.000 + -2.75x + x2 = 0 + 1.875
-2.75x + x2 = 0 + 1.875

Combine like terms: 0 + 1.875 = 1.875
-2.75x + x2 = 1.875

The x term is -2.75x.  Take half its coefficient (-1.375).
Square it (1.890625) and add it to both sides.

Add '1.890625' to each side of the equation.
-2.75x + 1.890625 + x2 = 1.875 + 1.890625

Reorder the terms:
1.890625 + -2.75x + x2 = 1.875 + 1.890625

Combine like terms: 1.875 + 1.890625 = 3.765625
1.890625 + -2.75x + x2 = 3.765625

Factor a perfect square on the left side:
(x + -1.375)(x + -1.375) = 3.765625

Calculate the square root of the right side: 1.940521837

Break this problem into two subproblems by setting 
(x + -1.375) equal to 1.940521837 and -1.940521837.

Subproblem 1

x + -1.375 = 1.940521837 Simplifying x + -1.375 = 1.940521837 Reorder the terms: -1.375 + x = 1.940521837 Solving -1.375 + x = 1.940521837 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.375' to each side of the equation. -1.375 + 1.375 + x = 1.940521837 + 1.375 Combine like terms: -1.375 + 1.375 = 0.000 0.000 + x = 1.940521837 + 1.375 x = 1.940521837 + 1.375 Combine like terms: 1.940521837 + 1.375 = 3.315521837 x = 3.315521837 Simplifying x = 3.315521837

Subproblem 2

x + -1.375 = -1.940521837 Simplifying x + -1.375 = -1.940521837 Reorder the terms: -1.375 + x = -1.940521837 Solving -1.375 + x = -1.940521837 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.375' to each side of the equation. -1.375 + 1.375 + x = -1.940521837 + 1.375 Combine like terms: -1.375 + 1.375 = 0.000 0.000 + x = -1.940521837 + 1.375 x = -1.940521837 + 1.375 Combine like terms: -1.940521837 + 1.375 = -0.565521837 x = -0.565521837 Simplifying x = -0.565521837

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.315521837, -0.565521837}

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