How do you evaluate $[( - 7\times 8) - ( - 15\times 4) ] - 3]$ ?

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Answer 1 · 2017-10-20T16:57:18

$4$

Let's take a look at this

$[(-7 xx 8) - (-15 xx 4)]$

We'll go through the "order of operations" (PEMDAS), starting with parentheses.

$[ color(white)(j) color(green)((-7 xx 8)) - color(red)((-15 xx 4)) color(white)(j) ]$

$color(green)(-7 xx 8)$ simplifies to $color(green)(-56)$

$color(red)(-15 xx 4)$ simplifies to $color(red)(-60)$

So, we have $[ color(white)(j) color(green)((-56)) - color(red)((-60)) color(white)(j) ]$

$-56- (-60)$ is the same as $-56+60$ , which is $4$

So, now we are left with
$[ color(white)(j) 4 color(white)(j) ]$ or just $4$

How do you evaluate [( - 7\times 8) - ( - 15\times 4) ] - 3] [( - 7\times 8) - ( - 15\times 4) ] - 3] ?