You can put this solution on YOUR website! :(a+2)(a+2)
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Use a procedure called FOIL:
F: first * first = a*a = a^2
O: multiply the outers: a*2 = 2a
I: Multiply the inners: 2*a = 2a
L: last * last = 2*2
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Combine those to get a^2 + 2a + 4
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Cheers,
Stan H.