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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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(2x - y + z)²

(2x - y + z)² = {2x + (- y) + z}²= (2x)² + (- y)² + (z)² + 2(2x)(- y) + 2(- y)(z) + 2(z)(2x)
| Using Identity V
= 4x² + y² + z²- 4xy -2yz + 4 zx

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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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