tentukan perkalian berikut.a. 3(a+5) b. -2(-2a+3) c. -xy(x-y) d. -5xypankat dua(xpangkat dua +xy- ypankatdua). tolong pakai jalan

a) 3 (a + 5)
= 3.a + 3.5
= 3a + 15

b) - 2( - 2a + 3)
= (-2)(-2a) + (-2)(3)
= 4a - 6

c) - xy (x - y)
= (-xy)(x ) + (-xy)(-y)
= - x²y + xy²

d) - 5xy²(x² + xy²)
= (-5xy²)(x²) + (-5xy²)(xy²)
= - 5x³y² - 5x²y⁴