16x^2-22x-7=0

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Solution for 16x^2-22x-7=0 equation:


Simplifying
16x2 + -22x + -7 = 0

Reorder the terms:
-7 + -22x + 16x2 = 0

Solving
-7 + -22x + 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'.
-0.4375 + -1.375x + x2 = 0

Move the constant term to the right:

Add '0.4375' to each side of the equation.
-0.4375 + -1.375x + 0.4375 + x2 = 0 + 0.4375

Reorder the terms:
-0.4375 + 0.4375 + -1.375x + x2 = 0 + 0.4375

Combine like terms: -0.4375 + 0.4375 = 0.0000
0.0000 + -1.375x + x2 = 0 + 0.4375
-1.375x + x2 = 0 + 0.4375

Combine like terms: 0 + 0.4375 = 0.4375
-1.375x + x2 = 0.4375

The x term is -1.375x.  Take half its coefficient (-0.6875).
Square it (0.47265625) and add it to both sides.

Add '0.47265625' to each side of the equation.
-1.375x + 0.47265625 + x2 = 0.4375 + 0.47265625

Reorder the terms:
0.47265625 + -1.375x + x2 = 0.4375 + 0.47265625

Combine like terms: 0.4375 + 0.47265625 = 0.91015625
0.47265625 + -1.375x + x2 = 0.91015625

Factor a perfect square on the left side:
(x + -0.6875)(x + -0.6875) = 0.91015625

Calculate the square root of the right side: 0.954021095

Break this problem into two subproblems by setting 
(x + -0.6875) equal to 0.954021095 and -0.954021095.

Subproblem 1

x + -0.6875 = 0.954021095 Simplifying x + -0.6875 = 0.954021095 Reorder the terms: -0.6875 + x = 0.954021095 Solving -0.6875 + x = 0.954021095 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.6875' to each side of the equation. -0.6875 + 0.6875 + x = 0.954021095 + 0.6875 Combine like terms: -0.6875 + 0.6875 = 0.0000 0.0000 + x = 0.954021095 + 0.6875 x = 0.954021095 + 0.6875 Combine like terms: 0.954021095 + 0.6875 = 1.641521095 x = 1.641521095 Simplifying x = 1.641521095

Subproblem 2

x + -0.6875 = -0.954021095 Simplifying x + -0.6875 = -0.954021095 Reorder the terms: -0.6875 + x = -0.954021095 Solving -0.6875 + x = -0.954021095 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.6875' to each side of the equation. -0.6875 + 0.6875 + x = -0.954021095 + 0.6875 Combine like terms: -0.6875 + 0.6875 = 0.0000 0.0000 + x = -0.954021095 + 0.6875 x = -0.954021095 + 0.6875 Combine like terms: -0.954021095 + 0.6875 = -0.266521095 x = -0.266521095 Simplifying x = -0.266521095

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.641521095, -0.266521095}

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