(3a+1/2b)(3a-1/2b)(9a方-1/4b方)

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(3a+1/2b)(3a-1/2b)(9a方-1/4b方)
(3a+1/2b)(3a-1/2b)(9a方-1/4b方)

(3a+1/2b)(3a-1/2b)(9a方-1/4b方)
(3a+b/2)(3a-b/2)(9a^2-b^2/4)
=(9a^2-b^2/4)(9a^2-b^2/4)
=(9a^2-b^2/4)^2
=81a^4-9a^2b^2/2+b^4/16