A=(X+1)(3X+1)

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Solution for A=(X+1)(3X+1) equation: 


Simplifying
A = (X + 1)(3X + 1)

Reorder the terms:
A = (1 + X)(3X + 1)

Reorder the terms:
A = (1 + X)(1 + 3X)

Multiply (1 + X) * (1 + 3X)
A = (1(1 + 3X) + X(1 + 3X))
A = ((1 * 1 + 3X * 1) + X(1 + 3X))
A = ((1 + 3X) + X(1 + 3X))
A = (1 + 3X + (1 * X + 3X * X))
A = (1 + 3X + (1X + 3X2))

Combine like terms: 3X + 1X = 4X
A = (1 + 4X + 3X2)

Solving
A = 1 + 4X + 3X2

Solving for variable 'A'.

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

Simplifying
A = 1 + 4X + 3X2

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