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LagrangeSon678
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difference of squares
Recall :
a^2b^2=(a+b)(ab)

GOODMAN
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okay thank you

LagrangeSon678
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in your case, a=x and b=3

GOODMAN
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okay so i still don't get it

LagrangeSon678
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If you have x^29
then we can write it as (x)^2(3)^2
so using that formula a^2b^2=(a+b)(ab),
we get(x+3)(x3)

GOODMAN
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ooohhhhh thanks sir