-6 x (-3) plz show ur work and what u used

Answer 1

The answer is 18...but I suspect what you want is the reason that (-a)(-b) = ab.

For this proof you need the distributive law.

Let a and b both be positive real numbers.

(-a)b + ab =[(-a) + a]b = 0*b = 0

add -(ab) to both sides: (-a)b = -(ab)

Now (-a)(-b) + [-(ab)] = (-a)(-b) + (-a)b =(-a)[(-b) + b] = (-a)*0 = 0

add ab to both sides: (-a)(-b) = ab.