4*x^2-3*x-69=0

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Solution for 4*x^2-3*x-69=0 equation:


Simplifying
4x2 + -3x + -69 = 0

Reorder the terms:
-69 + -3x + 4x2 = 0

Solving
-69 + -3x + 4x2 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
-17.25 + -0.75x + x2 = 0

Move the constant term to the right:

Add '17.25' to each side of the equation.
-17.25 + -0.75x + 17.25 + x2 = 0 + 17.25

Reorder the terms:
-17.25 + 17.25 + -0.75x + x2 = 0 + 17.25

Combine like terms: -17.25 + 17.25 = 0.00
0.00 + -0.75x + x2 = 0 + 17.25
-0.75x + x2 = 0 + 17.25

Combine like terms: 0 + 17.25 = 17.25
-0.75x + x2 = 17.25

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 = 17.25 + 0.140625

Reorder the terms:
0.140625 + -0.75x + x2 = 17.25 + 0.140625

Combine like terms: 17.25 + 0.140625 = 17.390625
0.140625 + -0.75x + x2 = 17.390625

Factor a perfect square on the left side:
(x + -0.375)(x + -0.375) = 17.390625

Calculate the square root of the right side: 4.170206829

Break this problem into two subproblems by setting 
(x + -0.375) equal to 4.170206829 and -4.170206829.

Subproblem 1

x + -0.375 = 4.170206829 Simplifying x + -0.375 = 4.170206829 Reorder the terms: -0.375 + x = 4.170206829 Solving -0.375 + x = 4.170206829 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 = 4.170206829 + 0.375 Combine like terms: -0.375 + 0.375 = 0.000 0.000 + x = 4.170206829 + 0.375 x = 4.170206829 + 0.375 Combine like terms: 4.170206829 + 0.375 = 4.545206829 x = 4.545206829 Simplifying x = 4.545206829

Subproblem 2

x + -0.375 = -4.170206829 Simplifying x + -0.375 = -4.170206829 Reorder the terms: -0.375 + x = -4.170206829 Solving -0.375 + x = -4.170206829 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 = -4.170206829 + 0.375 Combine like terms: -0.375 + 0.375 = 0.000 0.000 + x = -4.170206829 + 0.375 x = -4.170206829 + 0.375 Combine like terms: -4.170206829 + 0.375 = -3.795206829 x = -3.795206829 Simplifying x = -3.795206829

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.545206829, -3.795206829}

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