10-2a-a^2=0

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Solution for 10-2a-a^2=0 equation:


Simplifying
10 + -2a + -1a2 = 0

Solving
10 + -2a + -1a2 = 0

Solving for variable 'a'.

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-10 + 2a + a2 = 0

Move the constant term to the right:

Add '10' to each side of the equation.
-10 + 2a + 10 + a2 = 0 + 10

Reorder the terms:
-10 + 10 + 2a + a2 = 0 + 10

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

Combine like terms: 0 + 10 = 10
2a + a2 = 10

The a term is 2a.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2a + 1 + a2 = 10 + 1

Reorder the terms:
1 + 2a + a2 = 10 + 1

Combine like terms: 10 + 1 = 11
1 + 2a + a2 = 11

Factor a perfect square on the left side:
(a + 1)(a + 1) = 11

Calculate the square root of the right side: 3.31662479

Break this problem into two subproblems by setting 
(a + 1) equal to 3.31662479 and -3.31662479.

Subproblem 1

a + 1 = 3.31662479 Simplifying a + 1 = 3.31662479 Reorder the terms: 1 + a = 3.31662479 Solving 1 + a = 3.31662479 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + a = 3.31662479 + -1 Combine like terms: 1 + -1 = 0 0 + a = 3.31662479 + -1 a = 3.31662479 + -1 Combine like terms: 3.31662479 + -1 = 2.31662479 a = 2.31662479 Simplifying a = 2.31662479

Subproblem 2

a + 1 = -3.31662479 Simplifying a + 1 = -3.31662479 Reorder the terms: 1 + a = -3.31662479 Solving 1 + a = -3.31662479 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + a = -3.31662479 + -1 Combine like terms: 1 + -1 = 0 0 + a = -3.31662479 + -1 a = -3.31662479 + -1 Combine like terms: -3.31662479 + -1 = -4.31662479 a = -4.31662479 Simplifying a = -4.31662479

Solution

The solution to the problem is based on the solutions from the subproblems. a = {2.31662479, -4.31662479}

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