Question

calculati valoarea expresiei 3(x+y+z)-4 (x-y+z)+6(x-y-z) pen x=-6 ; y=-5 ; z =-8 ;

Answer 1

x=-6
 y=-5
z =-8 
3(x+y+z)-4 (x-y+z)+6(x-y-z)=3(-6-5-8)-4(-6+5-8)+6(-6+5+8)=3*(-19)-4*(-9)+6*7
=-57+36+42=-57+78=21