4a(a-4)=5

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Solution for 4a(a-4)=5 equation:


Simplifying
4a(a + -4) = 5

Reorder the terms:
4a(-4 + a) = 5
(-4 * 4a + a * 4a) = 5
(-16a + 4a2) = 5

Solving
-16a + 4a2 = 5

Solving for variable 'a'.

Reorder the terms:
-5 + -16a + 4a2 = 5 + -5

Combine like terms: 5 + -5 = 0
-5 + -16a + 4a2 = 0

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

Divide each side by '4'.
-1.25 + -4a + a2 = 0

Move the constant term to the right:

Add '1.25' to each side of the equation.
-1.25 + -4a + 1.25 + a2 = 0 + 1.25

Reorder the terms:
-1.25 + 1.25 + -4a + a2 = 0 + 1.25

Combine like terms: -1.25 + 1.25 = 0.00
0.00 + -4a + a2 = 0 + 1.25
-4a + a2 = 0 + 1.25

Combine like terms: 0 + 1.25 = 1.25
-4a + a2 = 1.25

The a term is -4a.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4a + 4 + a2 = 1.25 + 4

Reorder the terms:
4 + -4a + a2 = 1.25 + 4

Combine like terms: 1.25 + 4 = 5.25
4 + -4a + a2 = 5.25

Factor a perfect square on the left side:
(a + -2)(a + -2) = 5.25

Calculate the square root of the right side: 2.291287847

Break this problem into two subproblems by setting 
(a + -2) equal to 2.291287847 and -2.291287847.

Subproblem 1

a + -2 = 2.291287847 Simplifying a + -2 = 2.291287847 Reorder the terms: -2 + a = 2.291287847 Solving -2 + a = 2.291287847 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + a = 2.291287847 + 2 Combine like terms: -2 + 2 = 0 0 + a = 2.291287847 + 2 a = 2.291287847 + 2 Combine like terms: 2.291287847 + 2 = 4.291287847 a = 4.291287847 Simplifying a = 4.291287847

Subproblem 2

a + -2 = -2.291287847 Simplifying a + -2 = -2.291287847 Reorder the terms: -2 + a = -2.291287847 Solving -2 + a = -2.291287847 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + a = -2.291287847 + 2 Combine like terms: -2 + 2 = 0 0 + a = -2.291287847 + 2 a = -2.291287847 + 2 Combine like terms: -2.291287847 + 2 = -0.291287847 a = -0.291287847 Simplifying a = -0.291287847

Solution

The solution to the problem is based on the solutions from the subproblems. a = {4.291287847, -0.291287847}

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