4a*(80-2a)=.24

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Solution for 4a*(80-2a)=.24 equation:


Simplifying
4a(80 + -2a) = 0.24
(80 * 4a + -2a * 4a) = 0.24
(320a + -8a2) = 0.24

Solving
320a + -8a2 = 0.24

Solving for variable 'a'.

Reorder the terms:
-0.24 + 320a + -8a2 = 0.24 + -0.24

Combine like terms: 0.24 + -0.24 = 0.00
-0.24 + 320a + -8a2 = 0.00

Begin completing the square.  Divide all terms by
-8 the coefficient of the squared term: 

Divide each side by '-8'.
0.03 + -40a + a2 = 0.00

Move the constant term to the right:

Add '-0.03' to each side of the equation.
0.03 + -40a + -0.03 + a2 = 0.00 + -0.03

Reorder the terms:
0.03 + -0.03 + -40a + a2 = 0.00 + -0.03

Combine like terms: 0.03 + -0.03 = 0.00
0.00 + -40a + a2 = 0.00 + -0.03
-40a + a2 = 0.00 + -0.03

Combine like terms: 0.00 + -0.03 = -0.03
-40a + a2 = -0.03

The a term is -40a.  Take half its coefficient (-20).
Square it (400) and add it to both sides.

Add '400' to each side of the equation.
-40a + 400 + a2 = -0.03 + 400

Reorder the terms:
400 + -40a + a2 = -0.03 + 400

Combine like terms: -0.03 + 400 = 399.97
400 + -40a + a2 = 399.97

Factor a perfect square on the left side:
(a + -20)(a + -20) = 399.97

Calculate the square root of the right side: 19.999249986

Break this problem into two subproblems by setting 
(a + -20) equal to 19.999249986 and -19.999249986.

Subproblem 1

a + -20 = 19.999249986 Simplifying a + -20 = 19.999249986 Reorder the terms: -20 + a = 19.999249986 Solving -20 + a = 19.999249986 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + a = 19.999249986 + 20 Combine like terms: -20 + 20 = 0 0 + a = 19.999249986 + 20 a = 19.999249986 + 20 Combine like terms: 19.999249986 + 20 = 39.999249986 a = 39.999249986 Simplifying a = 39.999249986

Subproblem 2

a + -20 = -19.999249986 Simplifying a + -20 = -19.999249986 Reorder the terms: -20 + a = -19.999249986 Solving -20 + a = -19.999249986 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + a = -19.999249986 + 20 Combine like terms: -20 + 20 = 0 0 + a = -19.999249986 + 20 a = -19.999249986 + 20 Combine like terms: -19.999249986 + 20 = 0.000750014 a = 0.000750014 Simplifying a = 0.000750014

Solution

The solution to the problem is based on the solutions from the subproblems. a = {39.999249986, 0.000750014}

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