Question

-(-4-5)+4[(4(6-7)-2(4-1)]2+(5-10)]=

Answer 1

-(-4-5)+4[(4(6-7)-2(4-1)]2+(5-10)]=

-(-9)+4[(4(-1)-2(3))2+(-5)]=

-(-9)+4[(-4-6)2+(-5)]=

9+4[(-10)2+(-5)]=

9+4[-20-5]=

9+4[-25]=

9-100=

-91