tolong dibantu ya pls cuma ada 3 soal pakai cara

8•
samakan penyebutnya jadi (a + b)(a - b)

(a(a - b) + b(a + b))/(a + b)(a - b)
= (a² - ab + ab + b²)/(a² - b²)
= (a² + b²)/(a² - b²)

9•
samakan penyebutnya jadi a² - 1
➡ a² - 1 = (a - 1)(a + 1)

(3 - 2(a - 1))/(a² - 1)
= (5 - 2a)/(a² - 1)

10•
3/(x - 3)² - 2/(x² - 9)
= 3/(x - 3)² - 2/(x - 3)(x + 3)
samakan penyebutnya jadi (x - 3)²(x + 3)
= (3(x + 3) - 2(x - 3))/(x - 3)²(x + 3)
= (x + 15)/((x - 3)²(x + 3))