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20y - 100
b) (x + 5) × (5x - 1)
5x² - x + 25x - 5
5x² + 24x - 5
c) (7 - 2x) × (2x - 7)
14x - 49 - 4x² - 14x
-4x² + 14x - 14x - 49
-4x² - 49
3. (2x + 3y)(px + qy) = rx² + 23x + 12y²
(2x + 3y)(5x + 4y)
10x² + 8xy + 15xy + 12y²
10x² + 23xy + 12y²
Jadi r = 10
Gunakan sifat distributif
Bagian a.)
Bagian b.)
Bagian c.)
Nomor 3.
Gunakan trik dalam menjabarkan: