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Find the product of the following pairs ...

Find the product of the following pairs of polynomials: `4,\ 7x` (ii) `-4a ,\ 7a` (iii) `4x ,\ 7x y` `4x^3,-3x y` (v) `4x ,0`

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(i) `4,7x`
`4xx7x`
`4xx7xx x`
`(4xx7)xx x`
`28x`
`(ii) -4axx7a`
`-4xx7 xx axxa`
`-28xxa^2`
`-28a^3`
(iii)`4x xx7xy`
`(4xx7)xx(x xx x)xxy`
`28x^2y`
`(iv) 4x^3xx-3xy`
`(4xx-3)xx(x^3xx x)xy`
`-12x^4y`
`(v) 4x xx0`
`(4xx0)xx x`
`0xx x`
`0`
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