Question

Add 9mn,-4mn,-5mn,-12mn​

Answer 1

Answer:

9mn+(-4mn)+(-5mn)+(-12mn)

9mn-4mn-5mn-12mn

9mn-21mn

-12mn

Answer 2

SOLUTION:-

Add:

9mn, -4mn, -5mn, -12mn

Therefore,

=) 9mn +(-4mn) +(-5mn) + (-12mn)

=) 9mn -4mn - 5mn -12mn

=) mn(9-4-5-12)

=) mn (5-(5+12))

=) mn(5 -17)

=) mn(-12)

=) -12mn

Hope it helps ☺️