16x^2-5x-4=

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Solution for 16x^2-5x-4= equation:


Simplifying
16x2 + -5x + -4 = 0

Reorder the terms:
-4 + -5x + 16x2 = 0

Solving
-4 + -5x + 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 + -0.3125x + x2 = 0

Move the constant term to the right:

Add '0.25' to each side of the equation.
-0.25 + -0.3125x + 0.25 + x2 = 0 + 0.25

Reorder the terms:
-0.25 + 0.25 + -0.3125x + x2 = 0 + 0.25

Combine like terms: -0.25 + 0.25 = 0.00
0.00 + -0.3125x + x2 = 0 + 0.25
-0.3125x + x2 = 0 + 0.25

Combine like terms: 0 + 0.25 = 0.25
-0.3125x + x2 = 0.25

The x term is -0.3125x.  Take half its coefficient (-0.15625).
Square it (0.0244140625) and add it to both sides.

Add '0.0244140625' to each side of the equation.
-0.3125x + 0.0244140625 + x2 = 0.25 + 0.0244140625

Reorder the terms:
0.0244140625 + -0.3125x + x2 = 0.25 + 0.0244140625

Combine like terms: 0.25 + 0.0244140625 = 0.2744140625
0.0244140625 + -0.3125x + x2 = 0.2744140625

Factor a perfect square on the left side:
(x + -0.15625)(x + -0.15625) = 0.2744140625

Calculate the square root of the right side: 0.523845457

Break this problem into two subproblems by setting 
(x + -0.15625) equal to 0.523845457 and -0.523845457.

Subproblem 1

x + -0.15625 = 0.523845457 Simplifying x + -0.15625 = 0.523845457 Reorder the terms: -0.15625 + x = 0.523845457 Solving -0.15625 + x = 0.523845457 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.15625' to each side of the equation. -0.15625 + 0.15625 + x = 0.523845457 + 0.15625 Combine like terms: -0.15625 + 0.15625 = 0.00000 0.00000 + x = 0.523845457 + 0.15625 x = 0.523845457 + 0.15625 Combine like terms: 0.523845457 + 0.15625 = 0.680095457 x = 0.680095457 Simplifying x = 0.680095457

Subproblem 2

x + -0.15625 = -0.523845457 Simplifying x + -0.15625 = -0.523845457 Reorder the terms: -0.15625 + x = -0.523845457 Solving -0.15625 + x = -0.523845457 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.15625' to each side of the equation. -0.15625 + 0.15625 + x = -0.523845457 + 0.15625 Combine like terms: -0.15625 + 0.15625 = 0.00000 0.00000 + x = -0.523845457 + 0.15625 x = -0.523845457 + 0.15625 Combine like terms: -0.523845457 + 0.15625 = -0.367595457 x = -0.367595457 Simplifying x = -0.367595457

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.680095457, -0.367595457}

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