HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Question

HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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Answer 1

1.=(а²)²- (4²)²=(а²-16)(а²+16)=(а-4)(а+4)(а²+16)
    =(m-n)(m²+mn+n²)


2.    (138-38)(138+38)        100* 176
      ------------------------- =-------------------=  2
     (122-78)(122+78)           44* 200