Question

Calcule: F(-2).F(-1),F(0),F(1),F(2). Das seguintes funções:
A) f(x)=6X-7
B) f(x)=x²+4x-1
C) f(x)=2x

Answer 1

a)
f(-2) = 6*-2-7 = -19

f(-1) = 6*-1 -7 = -13

f(0) = 6*0 -7 = -7

f(1) = 6*1-7 = -1

f(2) = 6*2-7 = 5

b) f(-2) = ( -2)² +4*(-2) -1 = -5

f(-1) = (-1)² +4*(-1) -1 = -4

f(0) = -1

f(1) = 1² + 4*1 -1 = 4

f(2) = 2² + 4*2 -1 = 11

c) f(-2) = 2*(-2) = -4

f(-1) = 2*(-1) = -2

f(0) = 0

f(1) = 2

f(2) = 2*2 = 4.

Espero ter ajudado.

Answer 2

A) f(x)=6X-7

F(-2).F(-1)= [6.(-2)-7 ] . [6(-1)-7] = [ -12-7] .[-6-7]
==> [-19].[-13]==> 247

F(0)= 6.0 - 7 ==>  0 - 7 ==> - 7
F(1)= 6.1- 7 ==>  6 - 7 ==> - 1
F(2)= 6.2 - 7 ==> 12 - 7 ==> 5

f(x)=x²+4x-1

F(-2).F(-1)= [(-2)²+4(-2)-1].[(-1)²+4(-1)-1]
==> [4-8-1].[1-4-1]==> [-5][-4]==> 20

F(0)=  [(0)²+4(0)-1].[(0)²+4(0)-1]
==> [0-0-1].[0-0-1]==> [-][-1]==> 1

F(1)=  [(1)²+4(1)-1]==> 1+4 -1 ==> 4

F(2)=  [(2)²+4(2)-1]==> 4+8 -1 ==> 11

C) f(x)=2x

F(-2).F(-1)= [2(-2)].[2(-1)]==> [-4][-2]==> 8

F(0)= 2(0) ==> 0
F(1)= 2(1) ==> 2
F(2)= 2(2) ==> 4