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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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184. Factorise the following using appropriate identities:

straight x squared minus straight y squared over 100

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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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(3a -7b - c)¹

(3a - 7b - c)² = {3a + (- 7b) + (- c)}²= (3a)² + (- 7b)² + (- c)² + 2(3a)(- 7b) + 2(- 7b)(- c) + 2(- c)(3a)
= 9a² + 49b² + c² - 42ab + 14bc - 6ca

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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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