1x(15-x)=8.25

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Solution for 1x(15-x)=8.25 equation:


Simplifying
1x(15 + -1x) = 8.25
(15 * 1x + -1x * 1x) = 8.25
(15x + -1x2) = 8.25

Solving
15x + -1x2 = 8.25

Solving for variable 'x'.

Reorder the terms:
-8.25 + 15x + -1x2 = 8.25 + -8.25

Combine like terms: 8.25 + -8.25 = 0.00
-8.25 + 15x + -1x2 = 0.00

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
8.25 + -15x + x2 = 0.00

Move the constant term to the right:

Add '-8.25' to each side of the equation.
8.25 + -15x + -8.25 + x2 = 0.00 + -8.25

Reorder the terms:
8.25 + -8.25 + -15x + x2 = 0.00 + -8.25

Combine like terms: 8.25 + -8.25 = 0.00
0.00 + -15x + x2 = 0.00 + -8.25
-15x + x2 = 0.00 + -8.25

Combine like terms: 0.00 + -8.25 = -8.25
-15x + x2 = -8.25

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 = -8.25 + 56.25

Reorder the terms:
56.25 + -15x + x2 = -8.25 + 56.25

Combine like terms: -8.25 + 56.25 = 48
56.25 + -15x + x2 = 48

Factor a perfect square on the left side:
(x + -7.5)(x + -7.5) = 48

Calculate the square root of the right side: 6.92820323

Break this problem into two subproblems by setting 
(x + -7.5) equal to 6.92820323 and -6.92820323.

Subproblem 1

x + -7.5 = 6.92820323 Simplifying x + -7.5 = 6.92820323 Reorder the terms: -7.5 + x = 6.92820323 Solving -7.5 + x = 6.92820323 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 = 6.92820323 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + x = 6.92820323 + 7.5 x = 6.92820323 + 7.5 Combine like terms: 6.92820323 + 7.5 = 14.42820323 x = 14.42820323 Simplifying x = 14.42820323

Subproblem 2

x + -7.5 = -6.92820323 Simplifying x + -7.5 = -6.92820323 Reorder the terms: -7.5 + x = -6.92820323 Solving -7.5 + x = -6.92820323 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 = -6.92820323 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + x = -6.92820323 + 7.5 x = -6.92820323 + 7.5 Combine like terms: -6.92820323 + 7.5 = 0.57179677 x = 0.57179677 Simplifying x = 0.57179677

Solution

The solution to the problem is based on the solutions from the subproblems. x = {14.42820323, 0.57179677}

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