16x^2-120x-225=0

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Solution for 16x^2-120x-225=0 equation:


Simplifying
16x2 + -120x + -225 = 0

Reorder the terms:
-225 + -120x + 16x2 = 0

Solving
-225 + -120x + 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'.
-14.0625 + -7.5x + x2 = 0

Move the constant term to the right:

Add '14.0625' to each side of the equation.
-14.0625 + -7.5x + 14.0625 + x2 = 0 + 14.0625

Reorder the terms:
-14.0625 + 14.0625 + -7.5x + x2 = 0 + 14.0625

Combine like terms: -14.0625 + 14.0625 = 0.0000
0.0000 + -7.5x + x2 = 0 + 14.0625
-7.5x + x2 = 0 + 14.0625

Combine like terms: 0 + 14.0625 = 14.0625
-7.5x + x2 = 14.0625

The x term is -7.5x.  Take half its coefficient (-3.75).
Square it (14.0625) and add it to both sides.

Add '14.0625' to each side of the equation.
-7.5x + 14.0625 + x2 = 14.0625 + 14.0625

Reorder the terms:
14.0625 + -7.5x + x2 = 14.0625 + 14.0625

Combine like terms: 14.0625 + 14.0625 = 28.125
14.0625 + -7.5x + x2 = 28.125

Factor a perfect square on the left side:
(x + -3.75)(x + -3.75) = 28.125

Calculate the square root of the right side: 5.303300859

Break this problem into two subproblems by setting 
(x + -3.75) equal to 5.303300859 and -5.303300859.

Subproblem 1

x + -3.75 = 5.303300859 Simplifying x + -3.75 = 5.303300859 Reorder the terms: -3.75 + x = 5.303300859 Solving -3.75 + x = 5.303300859 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.75' to each side of the equation. -3.75 + 3.75 + x = 5.303300859 + 3.75 Combine like terms: -3.75 + 3.75 = 0.00 0.00 + x = 5.303300859 + 3.75 x = 5.303300859 + 3.75 Combine like terms: 5.303300859 + 3.75 = 9.053300859 x = 9.053300859 Simplifying x = 9.053300859

Subproblem 2

x + -3.75 = -5.303300859 Simplifying x + -3.75 = -5.303300859 Reorder the terms: -3.75 + x = -5.303300859 Solving -3.75 + x = -5.303300859 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.75' to each side of the equation. -3.75 + 3.75 + x = -5.303300859 + 3.75 Combine like terms: -3.75 + 3.75 = 0.00 0.00 + x = -5.303300859 + 3.75 x = -5.303300859 + 3.75 Combine like terms: -5.303300859 + 3.75 = -1.553300859 x = -1.553300859 Simplifying x = -1.553300859

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.053300859, -1.553300859}

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