16x^2-9x-4=0

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Solution for 16x^2-9x-4=0 equation:


Simplifying
16x2 + -9x + -4 = 0

Reorder the terms:
-4 + -9x + 16x2 = 0

Solving
-4 + -9x + 16x2 = 0

Solving for variable 'x'.

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

Divide each side by '16'.
-0.25 + -0.5625x + x2 = 0

Move the constant term to the right:

Add '0.25' to each side of the equation.
-0.25 + -0.5625x + 0.25 + x2 = 0 + 0.25

Reorder the terms:
-0.25 + 0.25 + -0.5625x + x2 = 0 + 0.25

Combine like terms: -0.25 + 0.25 = 0.00
0.00 + -0.5625x + x2 = 0 + 0.25
-0.5625x + x2 = 0 + 0.25

Combine like terms: 0 + 0.25 = 0.25
-0.5625x + x2 = 0.25

The x term is -0.5625x.  Take half its coefficient (-0.28125).
Square it (0.0791015625) and add it to both sides.

Add '0.0791015625' to each side of the equation.
-0.5625x + 0.0791015625 + x2 = 0.25 + 0.0791015625

Reorder the terms:
0.0791015625 + -0.5625x + x2 = 0.25 + 0.0791015625

Combine like terms: 0.25 + 0.0791015625 = 0.3291015625
0.0791015625 + -0.5625x + x2 = 0.3291015625

Factor a perfect square on the left side:
(x + -0.28125)(x + -0.28125) = 0.3291015625

Calculate the square root of the right side: 0.573673742

Break this problem into two subproblems by setting 
(x + -0.28125) equal to 0.573673742 and -0.573673742.

Subproblem 1

x + -0.28125 = 0.573673742 Simplifying x + -0.28125 = 0.573673742 Reorder the terms: -0.28125 + x = 0.573673742 Solving -0.28125 + x = 0.573673742 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.28125' to each side of the equation. -0.28125 + 0.28125 + x = 0.573673742 + 0.28125 Combine like terms: -0.28125 + 0.28125 = 0.00000 0.00000 + x = 0.573673742 + 0.28125 x = 0.573673742 + 0.28125 Combine like terms: 0.573673742 + 0.28125 = 0.854923742 x = 0.854923742 Simplifying x = 0.854923742

Subproblem 2

x + -0.28125 = -0.573673742 Simplifying x + -0.28125 = -0.573673742 Reorder the terms: -0.28125 + x = -0.573673742 Solving -0.28125 + x = -0.573673742 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.28125' to each side of the equation. -0.28125 + 0.28125 + x = -0.573673742 + 0.28125 Combine like terms: -0.28125 + 0.28125 = 0.00000 0.00000 + x = -0.573673742 + 0.28125 x = -0.573673742 + 0.28125 Combine like terms: -0.573673742 + 0.28125 = -0.292423742 x = -0.292423742 Simplifying x = -0.292423742

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.854923742, -0.292423742}

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