Question

How would you correctly insert a bracket preceded by a negative sign in the expression p − q + r?

Options

• p − (q − r)

• p − (q + r)

• p − (−q + r)

• p + (q − r)

Answer 1

p − (q − r)

Explanation:

The sign of q (originally −q) and r (originally +r) are both reversed when placed inside a bracket preceded by a minus sign.