Question

- 16m’n-(-25m’n)+(-7m’n)Which of the following is equivalent to the expression above?

Answer 1

As a rule , - times - = + and - times + = -

`\begin{gathered} -16m^2n-(-25m^2n)+(-7m^2n\text{ ) } \\ =-16m^2n+25m^2n-7m^2n\text{ ( based on the rule above )} \\ =+9m^2n-7m^2n\text{ ( -16 + 25 = + 9 )} \\ =+2m^2n \end{gathered}`

Therefore the correct answer to the question is 2m squared n