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

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Answer 1 · 2017-02-28T12:40:57

$-40$

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

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

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

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

$:.=-49+9$

$:.=-40$

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