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Verified Answer :

work inside the brackets first, and then you can multiply the two equations if they are able to be mutiplied...

LittleRedMe

{{ NOTE: ^2 means squared }}

(3d + 3) (2d^2 + 5d - 2)

Separate the first bracket to multiply by the second:
3d (2d^2 + 5d - 2) + 3 (2d^2 + 5d - 2)

Multiply out the brackets:
6d^3 + 15d^2 - 6d + 6d^2 + 15d - 6

Tidy up:
6d^3 + 21d^2 + 9d - 6

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