16x^2-144x-165=0

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Solution for 16x^2-144x-165=0 equation:


Simplifying
16x2 + -144x + -165 = 0

Reorder the terms:
-165 + -144x + 16x2 = 0

Solving
-165 + -144x + 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'.
-10.3125 + -9x + x2 = 0

Move the constant term to the right:

Add '10.3125' to each side of the equation.
-10.3125 + -9x + 10.3125 + x2 = 0 + 10.3125

Reorder the terms:
-10.3125 + 10.3125 + -9x + x2 = 0 + 10.3125

Combine like terms: -10.3125 + 10.3125 = 0.0000
0.0000 + -9x + x2 = 0 + 10.3125
-9x + x2 = 0 + 10.3125

Combine like terms: 0 + 10.3125 = 10.3125
-9x + x2 = 10.3125

The x term is -9x.  Take half its coefficient (-4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
-9x + 20.25 + x2 = 10.3125 + 20.25

Reorder the terms:
20.25 + -9x + x2 = 10.3125 + 20.25

Combine like terms: 10.3125 + 20.25 = 30.5625
20.25 + -9x + x2 = 30.5625

Factor a perfect square on the left side:
(x + -4.5)(x + -4.5) = 30.5625

Calculate the square root of the right side: 5.528336097

Break this problem into two subproblems by setting 
(x + -4.5) equal to 5.528336097 and -5.528336097.

Subproblem 1

x + -4.5 = 5.528336097 Simplifying x + -4.5 = 5.528336097 Reorder the terms: -4.5 + x = 5.528336097 Solving -4.5 + x = 5.528336097 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + x = 5.528336097 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + x = 5.528336097 + 4.5 x = 5.528336097 + 4.5 Combine like terms: 5.528336097 + 4.5 = 10.028336097 x = 10.028336097 Simplifying x = 10.028336097

Subproblem 2

x + -4.5 = -5.528336097 Simplifying x + -4.5 = -5.528336097 Reorder the terms: -4.5 + x = -5.528336097 Solving -4.5 + x = -5.528336097 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + x = -5.528336097 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + x = -5.528336097 + 4.5 x = -5.528336097 + 4.5 Combine like terms: -5.528336097 + 4.5 = -1.028336097 x = -1.028336097 Simplifying x = -1.028336097

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.028336097, -1.028336097}

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