Question

How do you evaluate `-7\times 7+ 9\times \frac { - 1} { - 1}`?

Answer 1

`-40`

Explanation:

`-7 xx 7+9 xx (-1)/(-1)`

`:.=(-7 xx 7)+(9 xx (-1)/(-1))`

`:.=-49+(9 xx cancel(-1)^1/1 xx 1/cancel(-1)^1)`

`:.=-49+(9 xx 1)`

`:.=-49+9`

`:.=-40`