Question

-20-a when a=-8 help pls pls
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Answer 1

The result is -12

Thanks..!

Answer 2

To ask this question, we will only need to replace.

`\sf \: \underline{Remembering \: \: Signal \: \: Rules:} \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: - * - = + \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ + * + = + \\ - * + = - \\ + * - = -`

With that, let's do the exercise:

`\: \: \: \: \: \sf-20 - a, when \: \: a = -8`

Replacing:

`\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \sf- 20 - ( - 8)`

Removing the parenthesis, remembering the sign rule

`\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \sf- 20 + 8`

To calculate, we can do a tactic: keep the sign of the largest number and subtract with the smallest number

Then:

`\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \sf - (20 - 8)`

Underteaching

`\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \sf- 12`

Result:

So the result of the equation is -12.