8a^2=15-8a

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Solution for 8a^2=15-8a equation:


Simplifying
8a2 = 15 + -8a

Solving
8a2 = 15 + -8a

Solving for variable 'a'.

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

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

Combine like terms: 15 + -15 = 0
-15 + 8a + 8a2 = 0 + -8a + 8a
-15 + 8a + 8a2 = -8a + 8a

Combine like terms: -8a + 8a = 0
-15 + 8a + 8a2 = 0

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

Divide each side by '8'.
-1.875 + a + a2 = 0

Move the constant term to the right:

Add '1.875' to each side of the equation.
-1.875 + a + 1.875 + a2 = 0 + 1.875

Reorder the terms:
-1.875 + 1.875 + a + a2 = 0 + 1.875

Combine like terms: -1.875 + 1.875 = 0.000
0.000 + a + a2 = 0 + 1.875
a + a2 = 0 + 1.875

Combine like terms: 0 + 1.875 = 1.875
a + a2 = 1.875

The a term is a.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
 + 0.25 + a2 = 1.875 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + a2 = 1.875 + 0.25

Combine like terms: 1.875 + 0.25 = 2.125
1.25 + a2 = 2.125

Factor a perfect square on the left side:
(a + 0.5)(a + 0.5) = 2.125

Calculate the square root of the right side: 1.457737974

Break this problem into two subproblems by setting 
(a + 0.5) equal to 1.457737974 and -1.457737974.

Subproblem 1

a + 0.5 = 1.457737974 Simplifying a + 0.5 = 1.457737974 Reorder the terms: 0.5 + a = 1.457737974 Solving 0.5 + a = 1.457737974 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + a = 1.457737974 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + a = 1.457737974 + -0.5 a = 1.457737974 + -0.5 Combine like terms: 1.457737974 + -0.5 = 0.957737974 a = 0.957737974 Simplifying a = 0.957737974

Subproblem 2

a + 0.5 = -1.457737974 Simplifying a + 0.5 = -1.457737974 Reorder the terms: 0.5 + a = -1.457737974 Solving 0.5 + a = -1.457737974 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + a = -1.457737974 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + a = -1.457737974 + -0.5 a = -1.457737974 + -0.5 Combine like terms: -1.457737974 + -0.5 = -1.957737974 a = -1.957737974 Simplifying a = -1.957737974

Solution

The solution to the problem is based on the solutions from the subproblems. a = {0.957737974, -1.957737974}

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