Question

y=5x-2x dada a função: f(1)+3f(-2)-9f(4)-f(1)

Answer 1

f(1)=5•1-2•1
f(1)=5-2
f(1)=3

f(-2)=5•(-2)-2•(-2)
f(-2)=-10+4
f(-2)=-6

f(4)=5•4-2•4
f(4)=20-8
f(4)=12

f(1)+3f(-2)-9f(4)-f(1)
3+3•(-6)-9•12-3
3-18-108-3
-15-111
-126