Question

1. Tentukan hasil perkalian dari
(2b + 3) (2b - 3)

2. Suatu fungsi di definisikan dengan
rumus f(x) = 4x - 1. Hitunglah f(2) dan
f(-1)

Answer 1

1. (2b + 3)(2b - 3)
 = 4b² - 6b + 6b - 9
 = 4b² - 12b - 9
 
2. rumus= f(x) = 4x - 1
 
f(2)= 4(2) - 1
     = 8 -1 = 7

f(-1)= 4(-1) - 1
       = -4 - 1 = -5

Answer 2

1.(2b + 3) (2b - 3)
=2b(2b - 3) + 3(2b - 3)
=2b(2b) + 2b(-3) + 3(2b) + 3(-3)
=4b² - 6b + 6b - 9
=4b² - 0 - 9
=4b² - 9

2.f(x) = 4x - 1
f(2) = 4(2) - 1
f(2) = 8 - 1
f(2) = 7

f(-1) = 4(-1) - 1
f(-1) = - 4 - 1
f(-1) = - 5