kak ini no1 gimana ya #Tolonkdonk

1.
a.
10 × (2y - 10)
= 20y - 100

b.
(x + 5) × (5x - 1)
= 5x² - x + 25x - 5
= 5x² + 24x - 5

c.
(7 - 2x) × (2x - 7)
= 14x - 49 - 4x² + 14x
= 14x + 14x - 49 - 4x²
= 28x - 49 - 4x²
= - 4x² - 49 + 28
= 4x² + 49 - 28

Maaf Kalau Salah

Kata kunci : perkalian aljabar
Mapel : Matematika

a) 10 ( 2y - 10 )
=> 20 y - 100

b) (x +5) (5x -1)
=> x(5x -1) +5(5x-1)
=> 5x^2 - x + 25x - 5
=> 5x^2 + 24x - 5

c) (7 -2x) (2x -7)
=> 7(2x - 7) -2x(2x - 7)
=> 14x - 49 - 4x^2 + 14x
=> -4x^2 + 14x + 14x - 49
=> -4x^2 + 28x - 49