Question

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cuando x = 2
a) f(x) = x+7,g(x)=x-7;
b) f(x)=x², g (x) = 1 - x ;
c) f(x) = x-2 , g (x) = x² / x² +1 ;
d) f(x) = 1/x , g(x) = 1 / x² ;
e) f(x) = x, g (x) = 1/ x³ ;
f) f(x) = 2x +5 , g (x) = 2 X² - x - 15

Answer 1

A)
f(x) = x + 7 ⇒ 2 + 7 ⇒ 9
g(x)= x - 7 ⇒ 2 - 7 ⇒ -5

b)
f(x)= x² ⇒ 2² ⇒ 4
g(x) = 1 - x ⇒ 1 - 2 ⇒ -1

c)
f(x) = x - 2 ⇒ 2 - 2 = 0
g(x) = x² / x² +1 ⇒ 2²/2² + 1 ⇒ 4/4 + 1 ⇒ 4/5 o 1 + 1 = 5

d)
f(x) = 1/x ⇒ 1/2
g(x) = 1 /x² ⇒ 1/4

e)
f(x) = x ⇒ 2
g(x) = 1/x³ ⇒ 1/8

f)
f(x) = 2x + 5 ⇒ 2(2) + 5 ⇒ 4 + 5 ⇒ 9
g (x) = 2x² - x - 15 ⇒ 2(2)² - 2 - 15 ⇒ 8 - 2 - 15 ⇒ -9