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a. (-7a)pangkat 3
=(-7a)(-7a)(-7a)
= - 343 a pangkat3
b. (3a+b) pangkat2
= (3a+b)(3a+b)
= 9a pangkat2 + 3ab + 3ab + b pangkat 2
= 9a pangkat 2 + 6ab+ b pangkat 2
tak jawab yg a sm b ajk ya. klk salah maaf