2a-a^2=13

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Solution for 2a-a^2=13 equation:


Simplifying
2a + -1a2 = 13

Solving
2a + -1a2 = 13

Solving for variable 'a'.

Reorder the terms:
-13 + 2a + -1a2 = 13 + -13

Combine like terms: 13 + -13 = 0
-13 + 2a + -1a2 = 0

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

Divide each side by '-1'.
13 + -2a + a2 = 0

Move the constant term to the right:

Add '-13' to each side of the equation.
13 + -2a + -13 + a2 = 0 + -13

Reorder the terms:
13 + -13 + -2a + a2 = 0 + -13

Combine like terms: 13 + -13 = 0
0 + -2a + a2 = 0 + -13
-2a + a2 = 0 + -13

Combine like terms: 0 + -13 = -13
-2a + a2 = -13

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 = -13 + 1

Reorder the terms:
1 + -2a + a2 = -13 + 1

Combine like terms: -13 + 1 = -12
1 + -2a + a2 = -12

Factor a perfect square on the left side:
(a + -1)(a + -1) = -12

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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