Question

(iv) 20-2 5+(-12) times 2(5-bar(2-9))

Answer 1

Answer:

= [20-2{5+(-12)} ×{2(5-2-9)}]

= 20-2(5-12)2(5-2-9)

= 20-4(-7)(5-2-9)

= 20-(-28)(5-2-9)

= 20-(-28)(3-9)

= 20-(-28)(-6)

= 20-168

= -148