Question

Dado a funçãoF(x)=2x-3,calcule: a)F(-4)+F(5)=
b) F(-1)+F(0)=
c) F(1/2)=
d) F(x)=4

Answer 1

f(x)=2x-3

f(-4) = 2*(-4)-3 = -11
f(-1) = 2*(-1)-3 = -5
f(0) = 2*0 -3 = -3
f(1/2) = 2*(1/2)-3 = -2
f(4) = 2*4-3 = 5
f(5) = 2(5)-3 = 7

a)F(-4)+F(5)= -11 + 7 = -4
b) F(-1)+F(0)=  -5 -3 = -8
c) F(1/2)= -2

d) F(x)=4
F(x)=2x-3
4 = 2x -3
4+3 = 2x
7 = 2x
x = 7/2