Question

solve it please I not know that if there is minus b and 20 value is -4 so b is equal to minus minus 4​

Answer 1

Answer:

Answer is actually 9

Step-by-step explanation:

The question is verify for a-(-b) = a+b using value a=5 and b=-4

Which will be 5-(-4) = 5+4

So Take LHS

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

And now verify rhs = 5+4 = 9

9=9

LHS=RHS

Hence proved