tolong bantu please ... 1.Diketahui f(x)= I 7x-2 I ditanya f(2) x f(3) -f(5) + f(-2)=...

F(2)=17(2)-21
=34-21
=23


F(3)=17(3)-21
51-21
=30


F(5)=17(5)-21
=85-21
=64


F(-2)=17(-2)-21
=-34-21
=-55

F(2) x f(3) - f(5)+f(-2)
=23 x 30 - 64 + 55
=681