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9x 2 + 6xy + y 2 9x 2 + 6xy + y 2 = (3x) 2 + 2(3x)(y) + (y) 2 = (3x + y) 2 = (3x + y) (3x + y) | Using Identity 1

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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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9x² + 6xy + y²

9x² + 6xy + y²= (3x)²+ 2(3x)(y) + (y)²= (3x + y)² = (3x + y) (3x + y)

| Using Identity 1

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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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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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