Question

tolong ya kak beserta cara

Answer 1

a² + a - 10 = 0
maka
a² = 10 - a

(a² - 3a + 2)(a² + 5a + 6) / (a² - 7a + 12)(a² + 9a + 20)
= (10 - a - 3a + 2)(10 - a + 5a + 6) / (a² - 7a + 12)(a² + 9a + 20)
= (-4a + 12)(4a + 16) / (a - 4)(a - 3)(a + 4)(a + 5)
= -4(a - 3)4(a + 4) / (a - 4)(a - 3)(a + 4)(a + 5)
= (-4)(4) / (a - 4)(a + 5)
= -16 / (a² + a - 20)
= -16 / (a² + a - 10 - 10)
= -16 / (0 - 10)
= -16 / (-10)
= 16 / 10
= 8/5

Jawaban B