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181. Expand the following:

(i) (x - 2y - 3z)² (ii)

open parentheses y minus square root of 3 close parentheses squared

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182. Factorise the following using appropriate identities:

9x² + 6xy + y²

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183. Factorise the following using appropriate identities:

4y² - 4y + 1

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straight x squared minus straight y squared over 100 straight x squared minus straight y squared over 100 equals left parenthesis straight x right parenthesis squared minus open parentheses straight y over 10 close parentheses squared space space space space space space space space space space space space space space space space space space space space space space space space space equals space open parentheses straight x plus straight y over 10 close parentheses space open parentheses straight x minus straight y over 10 close parentheses.

| Using Identity III]

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185. Expand each of the following using suitable identities:
(x + 2y + 4z)²

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186. Expand each of the following using suitable identities:
(- 2x + 3y + 2z)²

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187. Expand each of the following using suitable identities:
(- 2x + 3y + 2z)²

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188. Expand each of the following using suitable identities:
(3a -7b - c)²

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189. Expand each of the following using suitable identities:
(- 2x + 5y - 3z)²

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190. Expand each of the following using suitable identities:

open square brackets 1 fourth straight a minus 1 half straight b plus 1 close square brackets squared

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