(2a-3)(a-1)-2a-4=

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Solution for (2a-3)(a-1)-2a-4= equation:


Simplifying
(2a + -3)(a + -1) + -2a + -4 = 0

Reorder the terms:
(-3 + 2a)(a + -1) + -2a + -4 = 0

Reorder the terms:
(-3 + 2a)(-1 + a) + -2a + -4 = 0

Multiply (-3 + 2a) * (-1 + a)
(-3(-1 + a) + 2a * (-1 + a)) + -2a + -4 = 0
((-1 * -3 + a * -3) + 2a * (-1 + a)) + -2a + -4 = 0
((3 + -3a) + 2a * (-1 + a)) + -2a + -4 = 0
(3 + -3a + (-1 * 2a + a * 2a)) + -2a + -4 = 0
(3 + -3a + (-2a + 2a2)) + -2a + -4 = 0

Combine like terms: -3a + -2a = -5a
(3 + -5a + 2a2) + -2a + -4 = 0

Reorder the terms:
3 + -4 + -5a + -2a + 2a2 = 0

Combine like terms: 3 + -4 = -1
-1 + -5a + -2a + 2a2 = 0

Combine like terms: -5a + -2a = -7a
-1 + -7a + 2a2 = 0

Solving
-1 + -7a + 2a2 = 0

Solving for variable 'a'.

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

Divide each side by '2'.
-0.5 + -3.5a + a2 = 0

Move the constant term to the right:

Add '0.5' to each side of the equation.
-0.5 + -3.5a + 0.5 + a2 = 0 + 0.5

Reorder the terms:
-0.5 + 0.5 + -3.5a + a2 = 0 + 0.5

Combine like terms: -0.5 + 0.5 = 0.0
0.0 + -3.5a + a2 = 0 + 0.5
-3.5a + a2 = 0 + 0.5

Combine like terms: 0 + 0.5 = 0.5
-3.5a + a2 = 0.5

The a term is -3.5a.  Take half its coefficient (-1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
-3.5a + 3.0625 + a2 = 0.5 + 3.0625

Reorder the terms:
3.0625 + -3.5a + a2 = 0.5 + 3.0625

Combine like terms: 0.5 + 3.0625 = 3.5625
3.0625 + -3.5a + a2 = 3.5625

Factor a perfect square on the left side:
(a + -1.75)(a + -1.75) = 3.5625

Calculate the square root of the right side: 1.887458609

Break this problem into two subproblems by setting 
(a + -1.75) equal to 1.887458609 and -1.887458609.

Subproblem 1

a + -1.75 = 1.887458609 Simplifying a + -1.75 = 1.887458609 Reorder the terms: -1.75 + a = 1.887458609 Solving -1.75 + a = 1.887458609 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + a = 1.887458609 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + a = 1.887458609 + 1.75 a = 1.887458609 + 1.75 Combine like terms: 1.887458609 + 1.75 = 3.637458609 a = 3.637458609 Simplifying a = 3.637458609

Subproblem 2

a + -1.75 = -1.887458609 Simplifying a + -1.75 = -1.887458609 Reorder the terms: -1.75 + a = -1.887458609 Solving -1.75 + a = -1.887458609 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + a = -1.887458609 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + a = -1.887458609 + 1.75 a = -1.887458609 + 1.75 Combine like terms: -1.887458609 + 1.75 = -0.137458609 a = -0.137458609 Simplifying a = -0.137458609

Solution

The solution to the problem is based on the solutions from the subproblems. a = {3.637458609, -0.137458609}

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