0=-16x^2+120x+3

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Solution for 0=-16x^2+120x+3 equation:


Simplifying
0 = -16x2 + 120x + 3

Reorder the terms:
0 = 3 + 120x + -16x2

Solving
0 = 3 + 120x + -16x2

Solving for variable 'x'.

Combine like terms: 0 + -3 = -3
-3 + -120x + 16x2 = 3 + 120x + -16x2 + -3 + -120x + 16x2

Reorder the terms:
-3 + -120x + 16x2 = 3 + -3 + 120x + -120x + -16x2 + 16x2

Combine like terms: 3 + -3 = 0
-3 + -120x + 16x2 = 0 + 120x + -120x + -16x2 + 16x2
-3 + -120x + 16x2 = 120x + -120x + -16x2 + 16x2

Combine like terms: 120x + -120x = 0
-3 + -120x + 16x2 = 0 + -16x2 + 16x2
-3 + -120x + 16x2 = -16x2 + 16x2

Combine like terms: -16x2 + 16x2 = 0
-3 + -120x + 16x2 = 0

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

Divide each side by '16'.
-0.1875 + -7.5x + x2 = 0

Move the constant term to the right:

Add '0.1875' to each side of the equation.
-0.1875 + -7.5x + 0.1875 + x2 = 0 + 0.1875

Reorder the terms:
-0.1875 + 0.1875 + -7.5x + x2 = 0 + 0.1875

Combine like terms: -0.1875 + 0.1875 = 0.0000
0.0000 + -7.5x + x2 = 0 + 0.1875
-7.5x + x2 = 0 + 0.1875

Combine like terms: 0 + 0.1875 = 0.1875
-7.5x + x2 = 0.1875

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 = 0.1875 + 14.0625

Reorder the terms:
14.0625 + -7.5x + x2 = 0.1875 + 14.0625

Combine like terms: 0.1875 + 14.0625 = 14.25
14.0625 + -7.5x + x2 = 14.25

Factor a perfect square on the left side:
(x + -3.75)(x + -3.75) = 14.25

Calculate the square root of the right side: 3.774917218

Break this problem into two subproblems by setting 
(x + -3.75) equal to 3.774917218 and -3.774917218.

Subproblem 1

x + -3.75 = 3.774917218 Simplifying x + -3.75 = 3.774917218 Reorder the terms: -3.75 + x = 3.774917218 Solving -3.75 + x = 3.774917218 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 = 3.774917218 + 3.75 Combine like terms: -3.75 + 3.75 = 0.00 0.00 + x = 3.774917218 + 3.75 x = 3.774917218 + 3.75 Combine like terms: 3.774917218 + 3.75 = 7.524917218 x = 7.524917218 Simplifying x = 7.524917218

Subproblem 2

x + -3.75 = -3.774917218 Simplifying x + -3.75 = -3.774917218 Reorder the terms: -3.75 + x = -3.774917218 Solving -3.75 + x = -3.774917218 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 = -3.774917218 + 3.75 Combine like terms: -3.75 + 3.75 = 0.00 0.00 + x = -3.774917218 + 3.75 x = -3.774917218 + 3.75 Combine like terms: -3.774917218 + 3.75 = -0.024917218 x = -0.024917218 Simplifying x = -0.024917218

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.524917218, -0.024917218}

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