Question

se considera functia f: R-R , f(x)=2x+6
a) Calculati f(-2) × f(3) - 2 × f (-1)​

Answer 1

f(-2)=2×(-2)+6=-4+6=2

f(3)=2×3+6=6+6=12

f(-1)=2×(-1)+6=-2+6=4

f(-2)×f(3)-2×f(-1)=

=2×12-2×4

=24-8

=16