-2.25(x-1.5)(x-6)=0

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Solution for -2.25(x-1.5)(x-6)=0 equation:


Simplifying
-2.25(x + -1.5)(x + -6) = 0

Reorder the terms:
-2.25(-1.5 + x)(x + -6) = 0

Reorder the terms:
-2.25(-1.5 + x)(-6 + x) = 0

Multiply (-1.5 + x) * (-6 + x)
-2.25(-1.5(-6 + x) + x(-6 + x)) = 0
-2.25((-6 * -1.5 + x * -1.5) + x(-6 + x)) = 0
-2.25((9 + -1.5x) + x(-6 + x)) = 0
-2.25(9 + -1.5x + (-6 * x + x * x)) = 0
-2.25(9 + -1.5x + (-6x + x2)) = 0

Combine like terms: -1.5x + -6x = -7.5x
-2.25(9 + -7.5x + x2) = 0
(9 * -2.25 + -7.5x * -2.25 + x2 * -2.25) = 0
(-20.25 + 16.875x + -2.25x2) = 0

Solving
-20.25 + 16.875x + -2.25x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-2.25 the coefficient of the squared term: 

Divide each side by '-2.25'.
9 + -7.5x + x2 = 0

Move the constant term to the right:

Add '-9' to each side of the equation.
9 + -7.5x + -9 + x2 = 0 + -9

Reorder the terms:
9 + -9 + -7.5x + x2 = 0 + -9

Combine like terms: 9 + -9 = 0
0 + -7.5x + x2 = 0 + -9
-7.5x + x2 = 0 + -9

Combine like terms: 0 + -9 = -9
-7.5x + x2 = -9

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 = -9 + 14.0625

Reorder the terms:
14.0625 + -7.5x + x2 = -9 + 14.0625

Combine like terms: -9 + 14.0625 = 5.0625
14.0625 + -7.5x + x2 = 5.0625

Factor a perfect square on the left side:
(x + -3.75)(x + -3.75) = 5.0625

Calculate the square root of the right side: 2.25

Break this problem into two subproblems by setting 
(x + -3.75) equal to 2.25 and -2.25.

Subproblem 1

x + -3.75 = 2.25 Simplifying x + -3.75 = 2.25 Reorder the terms: -3.75 + x = 2.25 Solving -3.75 + x = 2.25 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 = 2.25 + 3.75 Combine like terms: -3.75 + 3.75 = 0.00 0.00 + x = 2.25 + 3.75 x = 2.25 + 3.75 Combine like terms: 2.25 + 3.75 = 6 x = 6 Simplifying x = 6

Subproblem 2

x + -3.75 = -2.25 Simplifying x + -3.75 = -2.25 Reorder the terms: -3.75 + x = -2.25 Solving -3.75 + x = -2.25 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 = -2.25 + 3.75 Combine like terms: -3.75 + 3.75 = 0.00 0.00 + x = -2.25 + 3.75 x = -2.25 + 3.75 Combine like terms: -2.25 + 3.75 = 1.5 x = 1.5 Simplifying x = 1.5

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6, 1.5}

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