(4a-3)(5a+5)=8

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Solution for (4a-3)(5a+5)=8 equation:


Simplifying
(4a + -3)(5a + 5) = 8

Reorder the terms:
(-3 + 4a)(5a + 5) = 8

Reorder the terms:
(-3 + 4a)(5 + 5a) = 8

Multiply (-3 + 4a) * (5 + 5a)
(-3(5 + 5a) + 4a * (5 + 5a)) = 8
((5 * -3 + 5a * -3) + 4a * (5 + 5a)) = 8
((-15 + -15a) + 4a * (5 + 5a)) = 8
(-15 + -15a + (5 * 4a + 5a * 4a)) = 8
(-15 + -15a + (20a + 20a2)) = 8

Combine like terms: -15a + 20a = 5a
(-15 + 5a + 20a2) = 8

Solving
-15 + 5a + 20a2 = 8

Solving for variable 'a'.

Reorder the terms:
-15 + -8 + 5a + 20a2 = 8 + -8

Combine like terms: -15 + -8 = -23
-23 + 5a + 20a2 = 8 + -8

Combine like terms: 8 + -8 = 0
-23 + 5a + 20a2 = 0

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

Divide each side by '20'.
-1.15 + 0.25a + a2 = 0.0

Move the constant term to the right:

Add '1.15' to each side of the equation.
-1.15 + 0.25a + 1.15 + a2 = 0.0 + 1.15

Reorder the terms:
-1.15 + 1.15 + 0.25a + a2 = 0.0 + 1.15

Combine like terms: -1.15 + 1.15 = 0.00
0.00 + 0.25a + a2 = 0.0 + 1.15
0.25a + a2 = 0.0 + 1.15

Combine like terms: 0.0 + 1.15 = 1.15
0.25a + a2 = 1.15

The a term is 0.25a.  Take half its coefficient (0.125).
Square it (0.015625) and add it to both sides.

Add '0.015625' to each side of the equation.
0.25a + 0.015625 + a2 = 1.15 + 0.015625

Reorder the terms:
0.015625 + 0.25a + a2 = 1.15 + 0.015625

Combine like terms: 1.15 + 0.015625 = 1.165625
0.015625 + 0.25a + a2 = 1.165625

Factor a perfect square on the left side:
(a + 0.125)(a + 0.125) = 1.165625

Calculate the square root of the right side: 1.079641144

Break this problem into two subproblems by setting 
(a + 0.125) equal to 1.079641144 and -1.079641144.

Subproblem 1

a + 0.125 = 1.079641144 Simplifying a + 0.125 = 1.079641144 Reorder the terms: 0.125 + a = 1.079641144 Solving 0.125 + a = 1.079641144 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-0.125' to each side of the equation. 0.125 + -0.125 + a = 1.079641144 + -0.125 Combine like terms: 0.125 + -0.125 = 0.000 0.000 + a = 1.079641144 + -0.125 a = 1.079641144 + -0.125 Combine like terms: 1.079641144 + -0.125 = 0.954641144 a = 0.954641144 Simplifying a = 0.954641144

Subproblem 2

a + 0.125 = -1.079641144 Simplifying a + 0.125 = -1.079641144 Reorder the terms: 0.125 + a = -1.079641144 Solving 0.125 + a = -1.079641144 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-0.125' to each side of the equation. 0.125 + -0.125 + a = -1.079641144 + -0.125 Combine like terms: 0.125 + -0.125 = 0.000 0.000 + a = -1.079641144 + -0.125 a = -1.079641144 + -0.125 Combine like terms: -1.079641144 + -0.125 = -1.204641144 a = -1.204641144 Simplifying a = -1.204641144

Solution

The solution to the problem is based on the solutions from the subproblems. a = {0.954641144, -1.204641144}

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