(5a^2+6a+2)-(7a^2-7a+5)=

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Solution for (5a^2+6a+2)-(7a^2-7a+5)= equation:


Simplifying
(5a2 + 6a + 2) + -1(7a2 + -7a + 5) = 0

Reorder the terms:
(2 + 6a + 5a2) + -1(7a2 + -7a + 5) = 0

Remove parenthesis around (2 + 6a + 5a2)
2 + 6a + 5a2 + -1(7a2 + -7a + 5) = 0

Reorder the terms:
2 + 6a + 5a2 + -1(5 + -7a + 7a2) = 0
2 + 6a + 5a2 + (5 * -1 + -7a * -1 + 7a2 * -1) = 0
2 + 6a + 5a2 + (-5 + 7a + -7a2) = 0

Reorder the terms:
2 + -5 + 6a + 7a + 5a2 + -7a2 = 0

Combine like terms: 2 + -5 = -3
-3 + 6a + 7a + 5a2 + -7a2 = 0

Combine like terms: 6a + 7a = 13a
-3 + 13a + 5a2 + -7a2 = 0

Combine like terms: 5a2 + -7a2 = -2a2
-3 + 13a + -2a2 = 0

Solving
-3 + 13a + -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'.
1.5 + -6.5a + a2 = 0

Move the constant term to the right:

Add '-1.5' to each side of the equation.
1.5 + -6.5a + -1.5 + a2 = 0 + -1.5

Reorder the terms:
1.5 + -1.5 + -6.5a + a2 = 0 + -1.5

Combine like terms: 1.5 + -1.5 = 0.0
0.0 + -6.5a + a2 = 0 + -1.5
-6.5a + a2 = 0 + -1.5

Combine like terms: 0 + -1.5 = -1.5
-6.5a + a2 = -1.5

The a term is -6.5a.  Take half its coefficient (-3.25).
Square it (10.5625) and add it to both sides.

Add '10.5625' to each side of the equation.
-6.5a + 10.5625 + a2 = -1.5 + 10.5625

Reorder the terms:
10.5625 + -6.5a + a2 = -1.5 + 10.5625

Combine like terms: -1.5 + 10.5625 = 9.0625
10.5625 + -6.5a + a2 = 9.0625

Factor a perfect square on the left side:
(a + -3.25)(a + -3.25) = 9.0625

Calculate the square root of the right side: 3.010398645

Break this problem into two subproblems by setting 
(a + -3.25) equal to 3.010398645 and -3.010398645.

Subproblem 1

a + -3.25 = 3.010398645 Simplifying a + -3.25 = 3.010398645 Reorder the terms: -3.25 + a = 3.010398645 Solving -3.25 + a = 3.010398645 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '3.25' to each side of the equation. -3.25 + 3.25 + a = 3.010398645 + 3.25 Combine like terms: -3.25 + 3.25 = 0.00 0.00 + a = 3.010398645 + 3.25 a = 3.010398645 + 3.25 Combine like terms: 3.010398645 + 3.25 = 6.260398645 a = 6.260398645 Simplifying a = 6.260398645

Subproblem 2

a + -3.25 = -3.010398645 Simplifying a + -3.25 = -3.010398645 Reorder the terms: -3.25 + a = -3.010398645 Solving -3.25 + a = -3.010398645 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '3.25' to each side of the equation. -3.25 + 3.25 + a = -3.010398645 + 3.25 Combine like terms: -3.25 + 3.25 = 0.00 0.00 + a = -3.010398645 + 3.25 a = -3.010398645 + 3.25 Combine like terms: -3.010398645 + 3.25 = 0.239601355 a = 0.239601355 Simplifying a = 0.239601355

Solution

The solution to the problem is based on the solutions from the subproblems. a = {6.260398645, 0.239601355}

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