8x^2-11=6x

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Solution for 8x^2-11=6x equation:


Simplifying
8x2 + -11 = 6x

Reorder the terms:
-11 + 8x2 = 6x

Solving
-11 + 8x2 = 6x

Solving for variable 'x'.

Reorder the terms:
-11 + -6x + 8x2 = 6x + -6x

Combine like terms: 6x + -6x = 0
-11 + -6x + 8x2 = 0

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

Divide each side by '8'.
-1.375 + -0.75x + x2 = 0

Move the constant term to the right:

Add '1.375' to each side of the equation.
-1.375 + -0.75x + 1.375 + x2 = 0 + 1.375

Reorder the terms:
-1.375 + 1.375 + -0.75x + x2 = 0 + 1.375

Combine like terms: -1.375 + 1.375 = 0.000
0.000 + -0.75x + x2 = 0 + 1.375
-0.75x + x2 = 0 + 1.375

Combine like terms: 0 + 1.375 = 1.375
-0.75x + x2 = 1.375

The x term is -0.75x.  Take half its coefficient (-0.375).
Square it (0.140625) and add it to both sides.

Add '0.140625' to each side of the equation.
-0.75x + 0.140625 + x2 = 1.375 + 0.140625

Reorder the terms:
0.140625 + -0.75x + x2 = 1.375 + 0.140625

Combine like terms: 1.375 + 0.140625 = 1.515625
0.140625 + -0.75x + x2 = 1.515625

Factor a perfect square on the left side:
(x + -0.375)(x + -0.375) = 1.515625

Calculate the square root of the right side: 1.231107225

Break this problem into two subproblems by setting 
(x + -0.375) equal to 1.231107225 and -1.231107225.

Subproblem 1

x + -0.375 = 1.231107225 Simplifying x + -0.375 = 1.231107225 Reorder the terms: -0.375 + x = 1.231107225 Solving -0.375 + x = 1.231107225 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.375' to each side of the equation. -0.375 + 0.375 + x = 1.231107225 + 0.375 Combine like terms: -0.375 + 0.375 = 0.000 0.000 + x = 1.231107225 + 0.375 x = 1.231107225 + 0.375 Combine like terms: 1.231107225 + 0.375 = 1.606107225 x = 1.606107225 Simplifying x = 1.606107225

Subproblem 2

x + -0.375 = -1.231107225 Simplifying x + -0.375 = -1.231107225 Reorder the terms: -0.375 + x = -1.231107225 Solving -0.375 + x = -1.231107225 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.375' to each side of the equation. -0.375 + 0.375 + x = -1.231107225 + 0.375 Combine like terms: -0.375 + 0.375 = 0.000 0.000 + x = -1.231107225 + 0.375 x = -1.231107225 + 0.375 Combine like terms: -1.231107225 + 0.375 = -0.856107225 x = -0.856107225 Simplifying x = -0.856107225

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.606107225, -0.856107225}

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