Kunci Jawaban Matematika Kelas 7 Halaman 222-224 Ayo Kita Berlatih 3.3, Perkalian Aljabar Terlengkap 2022

 = 5x² + (-x + 25x) - 5

 = 5x² + (-1 + 25)x - 5

= 5x² + 24x - 5

c.(7 - 2x) × (2x - 7) = ...

Cara Penyelesaian:

(7 - 2x) × (2x - 7) = 7(2x - 7) - 2x (2x - 7)

= (7(2x) - 7(7)) + (-2x(2x) - 2x(-7))

= (7)(2)x - 49 + (-2)(2)(x)(x) + (-2)(-7)x

= 14x - 49 - 4x² + 14x

= - 4x² + 14x + 14x - 49