2a^2-4a+7=0

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Solution for 2a^2-4a+7=0 equation:


Simplifying
2a2 + -4a + 7 = 0

Reorder the terms:
7 + -4a + 2a2 = 0

Solving
7 + -4a + 2a2 = 0

Solving for variable 'a'.

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

Divide each side by '2'.
3.5 + -2a + a2 = 0

Move the constant term to the right:

Add '-3.5' to each side of the equation.
3.5 + -2a + -3.5 + a2 = 0 + -3.5

Reorder the terms:
3.5 + -3.5 + -2a + a2 = 0 + -3.5

Combine like terms: 3.5 + -3.5 = 0.0
0.0 + -2a + a2 = 0 + -3.5
-2a + a2 = 0 + -3.5

Combine like terms: 0 + -3.5 = -3.5
-2a + a2 = -3.5

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 = -3.5 + 1

Reorder the terms:
1 + -2a + a2 = -3.5 + 1

Combine like terms: -3.5 + 1 = -2.5
1 + -2a + a2 = -2.5

Factor a perfect square on the left side:
(a + -1)(a + -1) = -2.5

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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