Factorize the following:
Greatest common factor of the two terms namely 28a2, 14a2b2, - 21a4 of expression 28a2 + 14a2b2 - 21a4 is 7a2
28a2 + 14a2b2-21a4 = 7a2(4 + 2b2 - 3a2)
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