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3x dikali - 5y = -15xy
2y dikali x = 2xy
2y dikali - 5y = - 10y²
3x² - 15xy + 2xy - 10y²
3x² - 13xy -10y²
( 3x + 2y ).( x - 5y )
|________| |
| dikali | = 3x² - 15xy
|___________|
dikali
( 3x + 2y ).( x - 5y )
|____| |
| dikali | = 2xy - 10y²
|_______|
dikali
Keduanya dijumlahkan jadi = 3x² - 15xy + 2xy - 10y²
= 3x² - 13xy - 10y²