Tolong jawab soal 1-5 hari ini juga:)

1.
-3 (a - 2b + 5) = (-3 × a) + (-3 × (-2b)) × (-3 × 5)
= -3a + 6b - 15

2.
xy (x^2 - 4) = (xy × x^2) + (xy × 4)
= x^3y + 4xy

3.
1/2 (2x + 6) = (1/2 × 2x) + (1/2 × 6)
= x + 3

4.
(3m + 2n) (3m - 2n) = (3m × 3m) + (3m × (-2n)) + (2n × 3m) × (2n × (-2n))
= 9m^2 - 6mn + 6mn - 4n^2
= 9m^2 - 4n^2

5.
(3 - a) (5 + a) = (3 × 5) + (3 × a) + (-a × 5) + (-a × a)
= 15 × 3a - 5a - a^2
= 15 - 2a - a^2