A=(40-2X)(20-2X)

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Solution for A=(40-2X)(20-2X) equation: 


Simplifying
A = (40 + -2X)(20 + -2X)

Multiply (40 + -2X) * (20 + -2X)
A = (40(20 + -2X) + -2X * (20 + -2X))
A = ((20 * 40 + -2X * 40) + -2X * (20 + -2X))
A = ((800 + -80X) + -2X * (20 + -2X))
A = (800 + -80X + (20 * -2X + -2X * -2X))
A = (800 + -80X + (-40X + 4X2))

Combine like terms: -80X + -40X = -120X
A = (800 + -120X + 4X2)

Solving
A = 800 + -120X + 4X2

Solving for variable 'A'.

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

Simplifying
A = 800 + -120X + 4X2

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