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Find the product \ 3y(x y+y^2) and find ...

Find the product `\ 3y(x y+y^2)` and find its value for `x=4\ a n d\ y=5.`

Text Solution

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`3y(xy+y^2)`
`=(3xx5)((4xx5)+5^2)`
`=15(20+25)`
`=15xx45`
`=675`
Hence,`3y(xy+y^2)=675` when `x=4,y=5`.
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