Unit 8 Test Review

Given f(x) = 2x and
g(x) = x²+3 , find f(g(x)).

• x²+2x+3
• 4x²+3
• 2x²+3
• 2x²+6

Given f(x)= -3x+7 and g(x)=2x² - 8, find f(g(x)).

• f(g(x))= -6x²+31
• f(g(x))= -6x²+24
• f(g(x))=18x²-84x+6
• f(g(x))=9x²-42x-1

f(x) = 3x + 10
g(x) = x - 2
Find g(f(-10))

• -42
• -26
• -18
• None of these.

f(x) = 3x + 10
g(x) = x - 2
Find (f∘g)(0)

• 16
• 4
• -4
• None of these.

Given f(x) = 3x + 10
and g(x) = x - 2
Find f(g(5))

• 19
• 23
• -10
• None of these.

Find g(f(x)), given f(x) = 2x - 8 and g(x) = 4x?

• 8x - 32

• 8x² - 32x

• 8x - 8

• 6x - 8

• 13

• 85

• 9

• 65

Using f(x)=2x and g(x)=x+1 find f(g(2))

• 4

• 6

• 5

• 3

Answer explanation

g(2)=2+1=3

f(3)=2(3)=6

Using f(x) = x - 3 and g(x) = 3x + 5, find f(g(5))

• 1

• 17

• 11

• 10

Answer explanation

g(5)=3(5)+5=20

f(20)=20-3=17