(-2x+3)(-x+15)=15

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Solution for (-2x+3)(-x+15)=15 equation:


Simplifying
(-2x + 3)(-1x + 15) = 15

Reorder the terms:
(3 + -2x)(-1x + 15) = 15

Reorder the terms:
(3 + -2x)(15 + -1x) = 15

Multiply (3 + -2x) * (15 + -1x)
(3(15 + -1x) + -2x * (15 + -1x)) = 15
((15 * 3 + -1x * 3) + -2x * (15 + -1x)) = 15
((45 + -3x) + -2x * (15 + -1x)) = 15
(45 + -3x + (15 * -2x + -1x * -2x)) = 15
(45 + -3x + (-30x + 2x2)) = 15

Combine like terms: -3x + -30x = -33x
(45 + -33x + 2x2) = 15

Solving
45 + -33x + 2x2 = 15

Solving for variable 'x'.

Reorder the terms:
45 + -15 + -33x + 2x2 = 15 + -15

Combine like terms: 45 + -15 = 30
30 + -33x + 2x2 = 15 + -15

Combine like terms: 15 + -15 = 0
30 + -33x + 2x2 = 0

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

Divide each side by '2'.
15 + -16.5x + x2 = 0

Move the constant term to the right:

Add '-15' to each side of the equation.
15 + -16.5x + -15 + x2 = 0 + -15

Reorder the terms:
15 + -15 + -16.5x + x2 = 0 + -15

Combine like terms: 15 + -15 = 0
0 + -16.5x + x2 = 0 + -15
-16.5x + x2 = 0 + -15

Combine like terms: 0 + -15 = -15
-16.5x + x2 = -15

The x term is -16.5x.  Take half its coefficient (-8.25).
Square it (68.0625) and add it to both sides.

Add '68.0625' to each side of the equation.
-16.5x + 68.0625 + x2 = -15 + 68.0625

Reorder the terms:
68.0625 + -16.5x + x2 = -15 + 68.0625

Combine like terms: -15 + 68.0625 = 53.0625
68.0625 + -16.5x + x2 = 53.0625

Factor a perfect square on the left side:
(x + -8.25)(x + -8.25) = 53.0625

Calculate the square root of the right side: 7.284401142

Break this problem into two subproblems by setting 
(x + -8.25) equal to 7.284401142 and -7.284401142.

Subproblem 1

x + -8.25 = 7.284401142 Simplifying x + -8.25 = 7.284401142 Reorder the terms: -8.25 + x = 7.284401142 Solving -8.25 + x = 7.284401142 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8.25' to each side of the equation. -8.25 + 8.25 + x = 7.284401142 + 8.25 Combine like terms: -8.25 + 8.25 = 0.00 0.00 + x = 7.284401142 + 8.25 x = 7.284401142 + 8.25 Combine like terms: 7.284401142 + 8.25 = 15.534401142 x = 15.534401142 Simplifying x = 15.534401142

Subproblem 2

x + -8.25 = -7.284401142 Simplifying x + -8.25 = -7.284401142 Reorder the terms: -8.25 + x = -7.284401142 Solving -8.25 + x = -7.284401142 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8.25' to each side of the equation. -8.25 + 8.25 + x = -7.284401142 + 8.25 Combine like terms: -8.25 + 8.25 = 0.00 0.00 + x = -7.284401142 + 8.25 x = -7.284401142 + 8.25 Combine like terms: -7.284401142 + 8.25 = 0.965598858 x = 0.965598858 Simplifying x = 0.965598858

Solution

The solution to the problem is based on the solutions from the subproblems. x = {15.534401142, 0.965598858}

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