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SmarticalParticals
So we need a perfect square. The "O" and "I" values in the FOIL method will cancel leaving you with an exponent and a negative integer. Look for the square root of both expressions.

4b^4 - 144 =
(2b^2 - 12)(2b^2 + 12)
apologiabiology
4b^4=(2b^2)^2
144=(12)^2

(2b^2)^2-(12)^2=(2b^2-12)(2b^2+12)

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