plese help me in maths
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Step-by-step explanation:
1). 7xy+3y²+8+(-13-14xy+2y²)
7xy+3y²+8-13-14xy+2y²
5y²-7xy-5
2). 7a²+6ab-(a²-3ab)
7a²+6ab-a²+3ab
6a²+9ab
3). (i). (a²+2ab)(b²+4ab)
a²b²+4a³b+2ab³+8a²b²
(ii). (a³-4a²)(a²-2a)
a^5- 2a⁴-4a⁴+8a³
a^5-6a⁴+8a³
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