a.10×(2y-0)=.... B.(×+5)×(5×-1)=.... C. (7-2×)×(2×-7)=.... plisss tolong jawab

a) 10 × (2y - 0)
= 20y

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

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