A=(k+8)(k+5)

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Solution for A=(k+8)(k+5) equation: 


Simplifying
A = (k + 8)(k + 5)

Reorder the terms:
A = (8 + k)(k + 5)

Reorder the terms:
A = (8 + k)(5 + k)

Multiply (8 + k) * (5 + k)
A = (8(5 + k) + k(5 + k))
A = ((5 * 8 + k * 8) + k(5 + k))
A = ((40 + 8k) + k(5 + k))
A = (40 + 8k + (5 * k + k * k))
A = (40 + 8k + (5k + k2))

Combine like terms: 8k + 5k = 13k
A = (40 + 13k + k2)

Solving
A = 40 + 13k + k2

Solving for variable 'A'.

Move all terms containing A to the left, all other terms to the right.

Simplifying
A = 40 + 13k + k2

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