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Find each of the following products: `(-2x^2)xx(7a^2x^7)xx(6a^5x^5)` (ii) `(4s^2t)xx(3s^3t^3)xx(2s t^4)xx(-2)`

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(i) `(-2x^2)xx(7a^2x^7)xx(6a^5x^5)`
`=(-2xx7xx6)xx(x^7timesx^5)xx(a^2xxa^5)`
`=-84a^7x^12`

(ii)`(4s^2t)xx(3s^3t^3)xx(2s t^4)xx(-2)`
`=[(4xx3xx2xx(-2)]xx(s^2xxs^3xxs)xx(txxt^3xxt^4)`
`=-48s^6t^8`
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