Matematica

1)
a) F(0) 2.0+3 =3
F(1) 2.1+3=5
F(2)2.2+3=7 . 2 14
R f(0)+ f(1)+ 2.f(2) 3+ 5+ 14= 22

b) f(x)= 2x+3 f(4) 2.4+ 3 =11

c) f(0)n2.0+3= 3

d)f(4) 2.4+3= 11
2)
F(X)= -3x+5
F(1)= -3.1+5= 2
F(4)= -3.4+5= -7
F(5)= -3.5+ 5= -10
F(1)+ F(4) + F(5)
2+ (-7) +(-10) =-15
3)
F(x-2) = 3x+5
F(0-2) = 3. (-2) + 5
F(0-2)= -6+ 5 = -1

4) nao fiz ainda

5) a)
F(X)=-2x+7
X=0 y=0 F(0)=-2.0+7 = 7 (0,7) -2x + 7 = 0
-2x= f(x)-7
X=-7/-2 =3,5 (3,5;0)

b) f(x)=9+3x x=0 (0,9) y=0 9+3x=0
3x=-9 (-3,0)
X=-9/3=-3

c)

d)f(x)= -x/3 + 1/3 x=0 y=0 (0, 1/3) f(0) = _ 0/3 + 1/3 = 1/3

-x/3 + 1/3 =0
-x/3= 1/3

X= 1/3 . 3 3/3= 1 (1,0)

e)

7)a) -3x-120
-3x=120
X= 120/-3 =40

b)
45- 90x
45- 90x=0
90x=45
X=45/90 = 0,5

8)
9)a)
f(x) 25-3x (a= -3<0)
25-3x=0
-3x=-25
X= -25/-3 = 8,33
Y > 0 x < -25/-3
Y=0 x = -25/-3
Y< 0 x> -25/-3
++++ - - - -
______|_______
-25/-3

B) f(x) – 8+24x (a= 24 > 0 )
-8+24x=0
24x=8
X= 8/24 Y > 0 x > 8/24
Y=0 x = 8/24
Y< 0 x < 8/24 - - - - ++++
_____|_____
8/24

10) a)
(35x-140) . (25+5x) > 0
35x-140=0
35x=140
X=140/35 = 4

25+5x=0
5x=-25
X=-25/5 = - 5
b)
3x-14≠1
3x-14=0
3x=14
X=14/3 ou 4,66
- - - - - - ++++++
_______|_________