-a+[2-a]a=4

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Solution for -a+[2-a]a=4 equation:


Simplifying
-1a + [2 + -1a] * a = 4

Reorder the terms for easier multiplication:
-1a + a[2 + -1a] = 4
-1a + [2 * a + -1a * a] = 4
-1a + [2a + -1a2] = 4

Combine like terms: -1a + 2a = 1a
1a + -1a2 = 4

Solving
1a + -1a2 = 4

Solving for variable 'a'.

Reorder the terms:
-4 + 1a + -1a2 = 4 + -4

Combine like terms: 4 + -4 = 0
-4 + 1a + -1a2 = 0

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

Divide each side by '-1'.
4 + -1a + a2 = 0

Move the constant term to the right:

Add '-4' to each side of the equation.
4 + -1a + -4 + a2 = 0 + -4

Reorder the terms:
4 + -4 + -1a + a2 = 0 + -4

Combine like terms: 4 + -4 = 0
0 + -1a + a2 = 0 + -4
-1a + a2 = 0 + -4

Combine like terms: 0 + -4 = -4
-1a + a2 = -4

The a term is -1a.  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.
-1a + 0.25 + a2 = -4 + 0.25

Reorder the terms:
0.25 + -1a + a2 = -4 + 0.25

Combine like terms: -4 + 0.25 = -3.75
0.25 + -1a + a2 = -3.75

Factor a perfect square on the left side:
(a + -0.5)(a + -0.5) = -3.75

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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