(5a^2-2a-8)-(a^2-6a+3)=

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Solution for (5a^2-2a-8)-(a^2-6a+3)= equation:


Simplifying
(5a2 + -2a + -8) + -1(a2 + -6a + 3) = 0

Reorder the terms:
(-8 + -2a + 5a2) + -1(a2 + -6a + 3) = 0

Remove parenthesis around (-8 + -2a + 5a2)
-8 + -2a + 5a2 + -1(a2 + -6a + 3) = 0

Reorder the terms:
-8 + -2a + 5a2 + -1(3 + -6a + a2) = 0
-8 + -2a + 5a2 + (3 * -1 + -6a * -1 + a2 * -1) = 0
-8 + -2a + 5a2 + (-3 + 6a + -1a2) = 0

Reorder the terms:
-8 + -3 + -2a + 6a + 5a2 + -1a2 = 0

Combine like terms: -8 + -3 = -11
-11 + -2a + 6a + 5a2 + -1a2 = 0

Combine like terms: -2a + 6a = 4a
-11 + 4a + 5a2 + -1a2 = 0

Combine like terms: 5a2 + -1a2 = 4a2
-11 + 4a + 4a2 = 0

Solving
-11 + 4a + 4a2 = 0

Solving for variable 'a'.

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

Divide each side by '4'.
-2.75 + a + a2 = 0

Move the constant term to the right:

Add '2.75' to each side of the equation.
-2.75 + a + 2.75 + a2 = 0 + 2.75

Reorder the terms:
-2.75 + 2.75 + a + a2 = 0 + 2.75

Combine like terms: -2.75 + 2.75 = 0.00
0.00 + a + a2 = 0 + 2.75
a + a2 = 0 + 2.75

Combine like terms: 0 + 2.75 = 2.75
a + a2 = 2.75

The a term is a.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
 + 0.25 + a2 = 2.75 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + a2 = 2.75 + 0.25

Combine like terms: 2.75 + 0.25 = 3
1.25 + a2 = 3

Factor a perfect square on the left side:
(a + 0.5)(a + 0.5) = 3

Calculate the square root of the right side: 1.732050808

Break this problem into two subproblems by setting 
(a + 0.5) equal to 1.732050808 and -1.732050808.

Subproblem 1

a + 0.5 = 1.732050808 Simplifying a + 0.5 = 1.732050808 Reorder the terms: 0.5 + a = 1.732050808 Solving 0.5 + a = 1.732050808 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + a = 1.732050808 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + a = 1.732050808 + -0.5 a = 1.732050808 + -0.5 Combine like terms: 1.732050808 + -0.5 = 1.232050808 a = 1.232050808 Simplifying a = 1.232050808

Subproblem 2

a + 0.5 = -1.732050808 Simplifying a + 0.5 = -1.732050808 Reorder the terms: 0.5 + a = -1.732050808 Solving 0.5 + a = -1.732050808 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + a = -1.732050808 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + a = -1.732050808 + -0.5 a = -1.732050808 + -0.5 Combine like terms: -1.732050808 + -0.5 = -2.232050808 a = -2.232050808 Simplifying a = -2.232050808

Solution

The solution to the problem is based on the solutions from the subproblems. a = {1.232050808, -2.232050808}

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