Selesaikan bentuk perkalian berikut!

A) -12x

b) 2x+8

c) -3a+6b

d) 15x+10y

e) 2x²+10x-3x-15 = 2x²+7x-15

f) x²+xy-xy-y² = x²-y²

g) 5m²n+20mn-m-4

A. 2 (-6x)
= 2 × -6x
= -12x

b. 2 (x + 4)
= (2 × x) + (2 × 4)
= 2x + 8

c. -3 (a – 2b)
= (-3 × a) (-3 × -2b)
= -3a + 6b

d. 5 (3x + 2y)
= (5 × 3x) (5 × 2y)
= 15x + 10y

e. (2x – 3) (x + 5)
= (2x × x) (2x × 5)  (-3 × x) (-3 × 5)
= 2x² + 10x – 3x – 15
= 2x² + 7x – 15

f. (x – y) (x + y)
= (x × x) (x × y)  (-y × x) (-y × y)
= x² + xy – xy – y²
= x² – y²

g. (5mn – 1) (m + 4)
= (5mn × m) (5mn × 4)  (-1 × m) (-1 × 4)
= 5m²n + 20mn – m – 4

Tandai sebagai yang terbaik yak 🙂