A+b=0 ab=-36 what is the value of a-b?

Step-by-step explanation:

What times what = - 36?

6*-6 can = - 36 and

6+-6 = 0 too

So the value of a would be 6 and b be - 6

And then a - b would be 6 - - 6 so you switch the negative 6 to a positive 6

And have 6 + 6 equaling 12.