a^2=7a-18

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Solution for a^2=7a-18 equation:


Simplifying
a2 = 7a + -18

Reorder the terms:
a2 = -18 + 7a

Solving
a2 = -18 + 7a

Solving for variable 'a'.

Reorder the terms:
18 + -7a + a2 = -18 + 7a + 18 + -7a

Reorder the terms:
18 + -7a + a2 = -18 + 18 + 7a + -7a

Combine like terms: -18 + 18 = 0
18 + -7a + a2 = 0 + 7a + -7a
18 + -7a + a2 = 7a + -7a

Combine like terms: 7a + -7a = 0
18 + -7a + a2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-18' to each side of the equation.
18 + -7a + -18 + a2 = 0 + -18

Reorder the terms:
18 + -18 + -7a + a2 = 0 + -18

Combine like terms: 18 + -18 = 0
0 + -7a + a2 = 0 + -18
-7a + a2 = 0 + -18

Combine like terms: 0 + -18 = -18
-7a + a2 = -18

The a term is -7a.  Take half its coefficient (-3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
-7a + 12.25 + a2 = -18 + 12.25

Reorder the terms:
12.25 + -7a + a2 = -18 + 12.25

Combine like terms: -18 + 12.25 = -5.75
12.25 + -7a + a2 = -5.75

Factor a perfect square on the left side:
(a + -3.5)(a + -3.5) = -5.75

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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