9=-2a(a+4)9a

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Solution for 9=-2a(a+4)9a equation: 


Simplifying
9 = -2a(a + 4) * 9a

Reorder the terms:
9 = -2a(4 + a) * 9a

Reorder the terms for easier multiplication:
9 = -2 * 9a * a(4 + a)

Multiply -2 * 9
9 = -18a * a(4 + a)

Multiply a * a
9 = -18a2(4 + a)
9 = (4 * -18a2 + a * -18a2)
9 = (-72a2 + -18a3)

Solving
9 = -72a2 + -18a3

Solving for variable 'a'.

Reorder the terms:
9 + 72a2 + 18a3 = -72a2 + 72a2 + -18a3 + 18a3

Combine like terms: -72a2 + 72a2 = 0
9 + 72a2 + 18a3 = 0 + -18a3 + 18a3
9 + 72a2 + 18a3 = -18a3 + 18a3

Combine like terms: -18a3 + 18a3 = 0
9 + 72a2 + 18a3 = 0

Factor out the Greatest Common Factor (GCF), '9'.
9(1 + 8a2 + 2a3) = 0

Ignore the factor 9.

Subproblem 1
Set the factor '(1 + 8a2 + 2a3)' equal to zero and attempt to solve:

Simplifying
1 + 8a2 + 2a3 = 0

Solving
1 + 8a2 + 2a3 = 0

The solution to this equation could not be determined.

This subproblem is being ignored because a solution could not be determined.

The solution to this equation could not be determined.

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