5a-a^2=40

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Solution for 5a-a^2=40 equation:


Simplifying
5a + -1a2 = 40

Solving
5a + -1a2 = 40

Solving for variable 'a'.

Reorder the terms:
-40 + 5a + -1a2 = 40 + -40

Combine like terms: 40 + -40 = 0
-40 + 5a + -1a2 = 0

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

Divide each side by '-1'.
40 + -5a + a2 = 0

Move the constant term to the right:

Add '-40' to each side of the equation.
40 + -5a + -40 + a2 = 0 + -40

Reorder the terms:
40 + -40 + -5a + a2 = 0 + -40

Combine like terms: 40 + -40 = 0
0 + -5a + a2 = 0 + -40
-5a + a2 = 0 + -40

Combine like terms: 0 + -40 = -40
-5a + a2 = -40

The a term is -5a.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5a + 6.25 + a2 = -40 + 6.25

Reorder the terms:
6.25 + -5a + a2 = -40 + 6.25

Combine like terms: -40 + 6.25 = -33.75
6.25 + -5a + a2 = -33.75

Factor a perfect square on the left side:
(a + -2.5)(a + -2.5) = -33.75

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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