18-6a=4a-a(a+3)

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Solution for 18-6a=4a-a(a+3) equation:


Simplifying
18 + -6a = 4a + -1a(a + 3)

Reorder the terms:
18 + -6a = 4a + -1a(3 + a)
18 + -6a = 4a + (3 * -1a + a * -1a)
18 + -6a = 4a + (-3a + -1a2)

Combine like terms: 4a + -3a = 1a
18 + -6a = 1a + -1a2

Solving
18 + -6a = 1a + -1a2

Solving for variable 'a'.

Combine like terms: -6a + -1a = -7a
18 + -7a + a2 = 1a + -1a2 + -1a + a2

Reorder the terms:
18 + -7a + a2 = 1a + -1a + -1a2 + a2

Combine like terms: 1a + -1a = 0
18 + -7a + a2 = 0 + -1a2 + a2
18 + -7a + a2 = -1a2 + a2

Combine like terms: -1a2 + a2 = 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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