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b.5x²+24x-5c
c.-35-4x²+14x
= 20y - 100
b. = (X + 5) x (5X - 1)
= 5X² - 1 + 25X - 5
= 5X² - 6 + 25X
c. = (7 - 2X) x (2X - 7)
= 7X - 49 - 2X² +14X²
= 7X - 49 + 12X²
2. Gak tau :3