Question

Simplify 9 - {x - (7 + x)}.

(a) 16
(b) -2x + 2
(c) -2x + 16
(d) 2x + 2

Answer 1

The correct answer is a) 16

Explanation:

To find this first distribute the interior negative to both terms in the parenthesis.

9 - {x - (7 + x)}

9 - {x - 7 - x}

Now simplify the like terms.

9 - {-7}

Now distribute the negative once again.

9 + 7

And complete the indicated operation.

16

Answer 2

A

Explanation:

To simplify the expression:

• multiply a negative into the inner parenthesis
• add like terms inside the outer parenthesis
• multiply a negative to the terms inside the parenthesis
• add like terms

9- {x-(7+x)}

9- {x-7-x}

9- {-7}

9+7

16