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(t³+5t²-12t) and (2t³-15t²+4t)
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Step-by-step explanation:
(t³+5t²-12t) + (2t³-15t²+4t)
= t³+ 5t²-12t+ 2t³-15t²+4t
=t³(1+2)+t²(5-15)-t(12-4)
= 3t³-10t²-8t answer
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