2(x*x)+19x-16=0

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Solution for 2(x*x)+19x-16=0 equation:


Simplifying
2(x * x) + 19x + -16 = 0

Multiply x * x
2(x2) + 19x + -16 = 0

Reorder the terms:
-16 + 19x + 2x2 = 0

Solving
-16 + 19x + 2x2 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
-8 + 9.5x + x2 = 0

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + 9.5x + 8 + x2 = 0 + 8

Reorder the terms:
-8 + 8 + 9.5x + x2 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + 9.5x + x2 = 0 + 8
9.5x + x2 = 0 + 8

Combine like terms: 0 + 8 = 8
9.5x + x2 = 8

The x term is 9.5x.  Take half its coefficient (4.75).
Square it (22.5625) and add it to both sides.

Add '22.5625' to each side of the equation.
9.5x + 22.5625 + x2 = 8 + 22.5625

Reorder the terms:
22.5625 + 9.5x + x2 = 8 + 22.5625

Combine like terms: 8 + 22.5625 = 30.5625
22.5625 + 9.5x + x2 = 30.5625

Factor a perfect square on the left side:
(x + 4.75)(x + 4.75) = 30.5625

Calculate the square root of the right side: 5.528336097

Break this problem into two subproblems by setting 
(x + 4.75) equal to 5.528336097 and -5.528336097.

Subproblem 1

x + 4.75 = 5.528336097 Simplifying x + 4.75 = 5.528336097 Reorder the terms: 4.75 + x = 5.528336097 Solving 4.75 + x = 5.528336097 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.75' to each side of the equation. 4.75 + -4.75 + x = 5.528336097 + -4.75 Combine like terms: 4.75 + -4.75 = 0.00 0.00 + x = 5.528336097 + -4.75 x = 5.528336097 + -4.75 Combine like terms: 5.528336097 + -4.75 = 0.778336097 x = 0.778336097 Simplifying x = 0.778336097

Subproblem 2

x + 4.75 = -5.528336097 Simplifying x + 4.75 = -5.528336097 Reorder the terms: 4.75 + x = -5.528336097 Solving 4.75 + x = -5.528336097 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.75' to each side of the equation. 4.75 + -4.75 + x = -5.528336097 + -4.75 Combine like terms: 4.75 + -4.75 = 0.00 0.00 + x = -5.528336097 + -4.75 x = -5.528336097 + -4.75 Combine like terms: -5.528336097 + -4.75 = -10.278336097 x = -10.278336097 Simplifying x = -10.278336097

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.778336097, -10.278336097}

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