Question

Verify the following-
A) 18x[7+(-3]=[18x7]+[18x(-3)]
B) (21)x[(-4)+(-6)]=[(-21)x(-4)]+[(-21)x(-6)]

Answer 1

a.    18 × [7-3] = 126 + [-54]        (+×- = -)
       18 × 4 = 126-54
       72 = 72
    therefore lhs = rhs
b.     21×[-10] = [84]+[126]             ( -×- = +)
       -210 =/= 210
    therefore lhs =/= (is not equal to) rhs

Answer 2

(a)
18*[7+(-3)]=[18*7]+[18*(-3)]
SOLUTION
18*[(7-3)]=[18*7]+[18*(-3)]
18*4=126+(-54)
72=126-54
72=72
SO LHS=RHS