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Multiply: (7x+y)b y(x+5y) (ii) (a-1...

Multiply: `(7x+y)b y(x+5y)` (ii) `(a-1)b y\ (0. 1 a^2+3)`

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(i)`(7x+y)b y(x+5y)`
`=7x^2+35xy+xy+5y^2`
`=7x^2+36xy+5y^2`

(ii) `(a-1)b y\ (0. 1 a^2+3)`
`=0.1a^3+3a-0.1a^2-3`
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