A=(x+1)(x-3)

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Solution for A=(x+1)(x-3) equation: 


Simplifying
A = (x + 1)(x + -3)

Reorder the terms:
A = (1 + x)(x + -3)

Reorder the terms:
A = (1 + x)(-3 + x)

Multiply (1 + x) * (-3 + x)
A = (1(-3 + x) + x(-3 + x))
A = ((-3 * 1 + x * 1) + x(-3 + x))
A = ((-3 + 1x) + x(-3 + x))
A = (-3 + 1x + (-3 * x + x * x))
A = (-3 + 1x + (-3x + x2))

Combine like terms: 1x + -3x = -2x
A = (-3 + -2x + x2)

Solving
A = -3 + -2x + x2

Solving for variable 'A'.

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

Simplifying
A = -3 + -2x + x2

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