Answer
Thus, two expressions equivalent to the opposite of the given polynomial are:
(1) $-(-3t^3+4t^2-7)$
(2) $3t^3-4t^2+7$
Work Step by Step
Two expressions equivalent to the opposite of a polynomial can be found by:
(1) taking the negative of the polynomial; and
(2) changing the sign of each term of the polynomial
Thus, two expressions equivalent to the opposite of the given polynomial are:
(1) $-(-3t^3+4t^2-7)$
(2) $3t^3-4t^2+7$