a(2a-8)=7a+10

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Solution for a(2a-8)=7a+10 equation:


Simplifying
a(2a + -8) = 7a + 10

Reorder the terms:
a(-8 + 2a) = 7a + 10
(-8 * a + 2a * a) = 7a + 10
(-8a + 2a2) = 7a + 10

Reorder the terms:
-8a + 2a2 = 10 + 7a

Solving
-8a + 2a2 = 10 + 7a

Solving for variable 'a'.

Reorder the terms:
-10 + -8a + -7a + 2a2 = 10 + 7a + -10 + -7a

Combine like terms: -8a + -7a = -15a
-10 + -15a + 2a2 = 10 + 7a + -10 + -7a

Reorder the terms:
-10 + -15a + 2a2 = 10 + -10 + 7a + -7a

Combine like terms: 10 + -10 = 0
-10 + -15a + 2a2 = 0 + 7a + -7a
-10 + -15a + 2a2 = 7a + -7a

Combine like terms: 7a + -7a = 0
-10 + -15a + 2a2 = 0

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

Divide each side by '2'.
-5 + -7.5a + a2 = 0

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + -7.5a + 5 + a2 = 0 + 5

Reorder the terms:
-5 + 5 + -7.5a + a2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -7.5a + a2 = 0 + 5
-7.5a + a2 = 0 + 5

Combine like terms: 0 + 5 = 5
-7.5a + a2 = 5

The a term is -7.5a.  Take half its coefficient (-3.75).
Square it (14.0625) and add it to both sides.

Add '14.0625' to each side of the equation.
-7.5a + 14.0625 + a2 = 5 + 14.0625

Reorder the terms:
14.0625 + -7.5a + a2 = 5 + 14.0625

Combine like terms: 5 + 14.0625 = 19.0625
14.0625 + -7.5a + a2 = 19.0625

Factor a perfect square on the left side:
(a + -3.75)(a + -3.75) = 19.0625

Calculate the square root of the right side: 4.366062299

Break this problem into two subproblems by setting 
(a + -3.75) equal to 4.366062299 and -4.366062299.

Subproblem 1

a + -3.75 = 4.366062299 Simplifying a + -3.75 = 4.366062299 Reorder the terms: -3.75 + a = 4.366062299 Solving -3.75 + a = 4.366062299 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '3.75' to each side of the equation. -3.75 + 3.75 + a = 4.366062299 + 3.75 Combine like terms: -3.75 + 3.75 = 0.00 0.00 + a = 4.366062299 + 3.75 a = 4.366062299 + 3.75 Combine like terms: 4.366062299 + 3.75 = 8.116062299 a = 8.116062299 Simplifying a = 8.116062299

Subproblem 2

a + -3.75 = -4.366062299 Simplifying a + -3.75 = -4.366062299 Reorder the terms: -3.75 + a = -4.366062299 Solving -3.75 + a = -4.366062299 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '3.75' to each side of the equation. -3.75 + 3.75 + a = -4.366062299 + 3.75 Combine like terms: -3.75 + 3.75 = 0.00 0.00 + a = -4.366062299 + 3.75 a = -4.366062299 + 3.75 Combine like terms: -4.366062299 + 3.75 = -0.616062299 a = -0.616062299 Simplifying a = -0.616062299

Solution

The solution to the problem is based on the solutions from the subproblems. a = {8.116062299, -0.616062299}

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