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221. Write (3a + 4b + 5c)² in expanded form.

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222. Expanded (4a - 2b - 3c)².

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223. Factorise: 4x² + y² + z² - 4xy - 2yz + 4xz.

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224. Write the following cubes in the expanded form:

(3a + 4b)³

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225. Write the following cubes in the expanded form:

(5p - 3q)³

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226. Write the following cubes in the expanded form:

(i) (104)³ (ii) (999)³.

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227. Factorise: 8x³ + 27y³ + 36x²y + 54xy².

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228. Factorise: 8x³ + y³ + 27z³ - 18xyz.

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229. If a² + b² + c² = 250 and ab + bc + ca = 3, find a + b + c.

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230. If a + b = 12 and ab = 21, find the value of a³ + b³.

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