18.75x-1.25x^2-63=0

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Solution for 18.75x-1.25x^2-63=0 equation:


Simplifying
18.75x + -1.25x2 + -63 = 0

Reorder the terms:
-63 + 18.75x + -1.25x2 = 0

Solving
-63 + 18.75x + -1.25x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-1.25 the coefficient of the squared term: 

Divide each side by '-1.25'.
50.4 + -15x + x2 = 0

Move the constant term to the right:

Add '-50.4' to each side of the equation.
50.4 + -15x + -50.4 + x2 = 0 + -50.4

Reorder the terms:
50.4 + -50.4 + -15x + x2 = 0 + -50.4

Combine like terms: 50.4 + -50.4 = 0.0
0.0 + -15x + x2 = 0 + -50.4
-15x + x2 = 0 + -50.4

Combine like terms: 0 + -50.4 = -50.4
-15x + x2 = -50.4

The x term is -15x.  Take half its coefficient (-7.5).
Square it (56.25) and add it to both sides.

Add '56.25' to each side of the equation.
-15x + 56.25 + x2 = -50.4 + 56.25

Reorder the terms:
56.25 + -15x + x2 = -50.4 + 56.25

Combine like terms: -50.4 + 56.25 = 5.85
56.25 + -15x + x2 = 5.85

Factor a perfect square on the left side:
(x + -7.5)(x + -7.5) = 5.85

Calculate the square root of the right side: 2.418677324

Break this problem into two subproblems by setting 
(x + -7.5) equal to 2.418677324 and -2.418677324.

Subproblem 1

x + -7.5 = 2.418677324 Simplifying x + -7.5 = 2.418677324 Reorder the terms: -7.5 + x = 2.418677324 Solving -7.5 + x = 2.418677324 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7.5' to each side of the equation. -7.5 + 7.5 + x = 2.418677324 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + x = 2.418677324 + 7.5 x = 2.418677324 + 7.5 Combine like terms: 2.418677324 + 7.5 = 9.918677324 x = 9.918677324 Simplifying x = 9.918677324

Subproblem 2

x + -7.5 = -2.418677324 Simplifying x + -7.5 = -2.418677324 Reorder the terms: -7.5 + x = -2.418677324 Solving -7.5 + x = -2.418677324 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7.5' to each side of the equation. -7.5 + 7.5 + x = -2.418677324 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + x = -2.418677324 + 7.5 x = -2.418677324 + 7.5 Combine like terms: -2.418677324 + 7.5 = 5.081322676 x = 5.081322676 Simplifying x = 5.081322676

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.918677324, 5.081322676}

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