Question

Selesaikan perkalian berikut.
a. (x-4) (x+3)
b. (2x-1) (x-5)
c. (2-3x) (5x+3)
d. (3x+4 (5-2x)

buat jalan nya yaa..
mkash..

Answer 1

A. (x - 4) (x + 3)
= (x × x) (x × 3) (-4 × x) (-4 × 3)
= x² + 3x - 4x - 12
= x² - x - 12

b. (2x - 1) (x - 5)
= (2x × x) (2x × -5) (-1 × x) (-1 × -5)
= 2x² - 10x - x + 5
= 2x² - 11x + 5

c. (2 - 3x) (5x + 3)
= (2 × 5x) (2 × 3) (-3x × 5x) (-3x × 3)
= 10x + 6 - 15x² - 9x
= -15x² + 10x - 9x + 6
= -15x² + x + 6

d. (3x + 4) (5 - 2x)
= (3x × 5) (3x × -2x) (4 × 5) (4 × -2x)
= 15x - 6x² + 20 - 8x
= -6x² + 15x - 8x + 20
= -6x² + 7x + 20