Tolong bantu no 1 A, B No2. A, B, C NO3. A, B, C NO4. ABC ISI CARA MAKASSII

saya kerjainnnya di kertass

1. a. 2(x+4)
= 2(x) + 2(4)
= 2x + 8

b. -3(a - 2b)
= -3(a) + -3(-2b)
= -3a +6b

2. a. (2x-3) (x+5)
= 2x(x) + {-3(x)} + 2x(5) + {-3(5)}
= 2x² + (-3x) + 10x + (-15)
= 2x² + 7x - 15

b. (3x - y) (x+y)
= 3x(x) + {-y(x)} + 3x(y) + {-y(y)}
= 3x² + (-xy) + 3xy + (-y²)
= 3x² +2xy - y²

c.(5m-1) (m+4)
= 5m(m) + {-1(m)} + 5m(4) + {-1(4)}
= 5m² + (-1m) + 20m + (-4)
= 5m² + 19m - 4

3. a. (2x + 3) (x-4)
= 2x² - 5x - 12

b. (a+ 3b) (a-5b)
= a² -2ab - 15b²

c. (5m-1) (2m+4)
= 10m² + 18m - 4

4. a. ab(a + 2b -c)
= a²b + 2ab² - abc

b. 5xy(x-3y+5)
= 5x²y -15xy² + 25xy

c. 2xy(x-3y)
= 2x²y -6xy²