Question

calculați: f(1) + f (2)+...+ f(6).​

Answer 1

f(1)= -2×1+4=-2+4=2

f(2)=-2×2+4=-4+4=0

f(3)=-2×3+4=-6+4=-2

f(4)=-2×4+4=-8+4=-4

f(5)=-2×5+4=-10+4=-6

f(6)=-2×6+4=-12+4=-8

2+0+(-2)+(-4)+(-6)+(-8)=

2-2-4-6-8=

0-4-6-8=

-10-8=

-18