5(a+16)a=4

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Solution for 5(a+16)a=4 equation:


Simplifying
5(a + 16) * a = 4

Reorder the terms:
5(16 + a) * a = 4

Reorder the terms for easier multiplication:
5a(16 + a) = 4
(16 * 5a + a * 5a) = 4
(80a + 5a2) = 4

Solving
80a + 5a2 = 4

Solving for variable 'a'.

Reorder the terms:
-4 + 80a + 5a2 = 4 + -4

Combine like terms: 4 + -4 = 0
-4 + 80a + 5a2 = 0

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

Divide each side by '5'.
-0.8 + 16a + a2 = 0

Move the constant term to the right:

Add '0.8' to each side of the equation.
-0.8 + 16a + 0.8 + a2 = 0 + 0.8

Reorder the terms:
-0.8 + 0.8 + 16a + a2 = 0 + 0.8

Combine like terms: -0.8 + 0.8 = 0.0
0.0 + 16a + a2 = 0 + 0.8
16a + a2 = 0 + 0.8

Combine like terms: 0 + 0.8 = 0.8
16a + a2 = 0.8

The a term is 16a.  Take half its coefficient (8).
Square it (64) and add it to both sides.

Add '64' to each side of the equation.
16a + 64 + a2 = 0.8 + 64

Reorder the terms:
64 + 16a + a2 = 0.8 + 64

Combine like terms: 0.8 + 64 = 64.8
64 + 16a + a2 = 64.8

Factor a perfect square on the left side:
(a + 8)(a + 8) = 64.8

Calculate the square root of the right side: 8.049844719

Break this problem into two subproblems by setting 
(a + 8) equal to 8.049844719 and -8.049844719.

Subproblem 1

a + 8 = 8.049844719 Simplifying a + 8 = 8.049844719 Reorder the terms: 8 + a = 8.049844719 Solving 8 + a = 8.049844719 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + a = 8.049844719 + -8 Combine like terms: 8 + -8 = 0 0 + a = 8.049844719 + -8 a = 8.049844719 + -8 Combine like terms: 8.049844719 + -8 = 0.049844719 a = 0.049844719 Simplifying a = 0.049844719

Subproblem 2

a + 8 = -8.049844719 Simplifying a + 8 = -8.049844719 Reorder the terms: 8 + a = -8.049844719 Solving 8 + a = -8.049844719 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + a = -8.049844719 + -8 Combine like terms: 8 + -8 = 0 0 + a = -8.049844719 + -8 a = -8.049844719 + -8 Combine like terms: -8.049844719 + -8 = -16.049844719 a = -16.049844719 Simplifying a = -16.049844719

Solution

The solution to the problem is based on the solutions from the subproblems. a = {0.049844719, -16.049844719}

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