81a2+18ab+b2= Подайте у вигляді квадрата двочлена

как перевести задание из рабочей тетради: Give the english equivalents. Mind the prepositions.

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Supply the correct participal adjective. Keep in mind that the  -ing participle has active force while the  -ed participle has passive force.

1)The horses cropped grass and there was the (comfort) sound of not being alone.

2)Why were they taking picures with a (hide) camera?

3)Fancy a (marry) woman doomed to live on without one single quarrel with her (love) husband.

4)There was a long line of (abandon) truks and carts on the road (lead) up the bridge.

5)Trembling from fear he came up to the gate of a house (surround) by a tall hedge.

6)She went up to the window (overlook) the garden.

7) She is not the kind of a woman who is generally (give) to conversation.

8)There was a balcony along the thid floor (hold up) by the columns. 

Какова роль растений в круговороте материи и потоке энергии в биосфере?