8x^2-3x-36=-12

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Solution for 8x^2-3x-36=-12 equation:


Simplifying
8x2 + -3x + -36 = -12

Reorder the terms:
-36 + -3x + 8x2 = -12

Solving
-36 + -3x + 8x2 = -12

Solving for variable 'x'.

Reorder the terms:
-36 + 12 + -3x + 8x2 = -12 + 12

Combine like terms: -36 + 12 = -24
-24 + -3x + 8x2 = -12 + 12

Combine like terms: -12 + 12 = 0
-24 + -3x + 8x2 = 0

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

Divide each side by '8'.
-3 + -0.375x + x2 = 0

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + -0.375x + 3 + x2 = 0 + 3

Reorder the terms:
-3 + 3 + -0.375x + x2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + -0.375x + x2 = 0 + 3
-0.375x + x2 = 0 + 3

Combine like terms: 0 + 3 = 3
-0.375x + x2 = 3

The x term is -0.375x.  Take half its coefficient (-0.1875).
Square it (0.03515625) and add it to both sides.

Add '0.03515625' to each side of the equation.
-0.375x + 0.03515625 + x2 = 3 + 0.03515625

Reorder the terms:
0.03515625 + -0.375x + x2 = 3 + 0.03515625

Combine like terms: 3 + 0.03515625 = 3.03515625
0.03515625 + -0.375x + x2 = 3.03515625

Factor a perfect square on the left side:
(x + -0.1875)(x + -0.1875) = 3.03515625

Calculate the square root of the right side: 1.742169983

Break this problem into two subproblems by setting 
(x + -0.1875) equal to 1.742169983 and -1.742169983.

Subproblem 1

x + -0.1875 = 1.742169983 Simplifying x + -0.1875 = 1.742169983 Reorder the terms: -0.1875 + x = 1.742169983 Solving -0.1875 + x = 1.742169983 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1875' to each side of the equation. -0.1875 + 0.1875 + x = 1.742169983 + 0.1875 Combine like terms: -0.1875 + 0.1875 = 0.0000 0.0000 + x = 1.742169983 + 0.1875 x = 1.742169983 + 0.1875 Combine like terms: 1.742169983 + 0.1875 = 1.929669983 x = 1.929669983 Simplifying x = 1.929669983

Subproblem 2

x + -0.1875 = -1.742169983 Simplifying x + -0.1875 = -1.742169983 Reorder the terms: -0.1875 + x = -1.742169983 Solving -0.1875 + x = -1.742169983 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1875' to each side of the equation. -0.1875 + 0.1875 + x = -1.742169983 + 0.1875 Combine like terms: -0.1875 + 0.1875 = 0.0000 0.0000 + x = -1.742169983 + 0.1875 x = -1.742169983 + 0.1875 Combine like terms: -1.742169983 + 0.1875 = -1.554669983 x = -1.554669983 Simplifying x = -1.554669983

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.929669983, -1.554669983}

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