6x^2+9x-64=0

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Solution for 6x^2+9x-64=0 equation:


Simplifying
6x2 + 9x + -64 = 0

Reorder the terms:
-64 + 9x + 6x2 = 0

Solving
-64 + 9x + 6x2 = 0

Solving for variable 'x'.

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

Divide each side by '6'.
-10.66666667 + 1.5x + x2 = 0

Move the constant term to the right:

Add '10.66666667' to each side of the equation.
-10.66666667 + 1.5x + 10.66666667 + x2 = 0 + 10.66666667

Reorder the terms:
-10.66666667 + 10.66666667 + 1.5x + x2 = 0 + 10.66666667

Combine like terms: -10.66666667 + 10.66666667 = 0.00000000
0.00000000 + 1.5x + x2 = 0 + 10.66666667
1.5x + x2 = 0 + 10.66666667

Combine like terms: 0 + 10.66666667 = 10.66666667
1.5x + x2 = 10.66666667

The x term is 1.5x.  Take half its coefficient (0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
1.5x + 0.5625 + x2 = 10.66666667 + 0.5625

Reorder the terms:
0.5625 + 1.5x + x2 = 10.66666667 + 0.5625

Combine like terms: 10.66666667 + 0.5625 = 11.22916667
0.5625 + 1.5x + x2 = 11.22916667

Factor a perfect square on the left side:
(x + 0.75)(x + 0.75) = 11.22916667

Calculate the square root of the right side: 3.350994878

Break this problem into two subproblems by setting 
(x + 0.75) equal to 3.350994878 and -3.350994878.

Subproblem 1

x + 0.75 = 3.350994878 Simplifying x + 0.75 = 3.350994878 Reorder the terms: 0.75 + x = 3.350994878 Solving 0.75 + x = 3.350994878 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = 3.350994878 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = 3.350994878 + -0.75 x = 3.350994878 + -0.75 Combine like terms: 3.350994878 + -0.75 = 2.600994878 x = 2.600994878 Simplifying x = 2.600994878

Subproblem 2

x + 0.75 = -3.350994878 Simplifying x + 0.75 = -3.350994878 Reorder the terms: 0.75 + x = -3.350994878 Solving 0.75 + x = -3.350994878 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = -3.350994878 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = -3.350994878 + -0.75 x = -3.350994878 + -0.75 Combine like terms: -3.350994878 + -0.75 = -4.100994878 x = -4.100994878 Simplifying x = -4.100994878

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.600994878, -4.100994878}

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