Tolong bantu kerjakan ya kak…bingung banget sama soal ini
a. -2 9/16
b. 1 1/8
Penjelasan dengan langkah-langkah:
2x² + 3x - 8 = 0
a = 2, b = 3, c = -8
a + b = -b/a = -3/2
a.b = c/a = -8/2 = -4
a. a/b + b/a = (a²+b²)/(ab)
= [(a+b)²-2ab]/(a.b)
= [(-3/2)² - 2.(-4)]/-4
= [9/4 + 8)/-4
= -9/16 - 2
= -2 9/16
b. 3/a + 3/b = [3(a+b)]/(a.b)
= [3(-3/2)]/(-4)
= (-9/2)/(-4)
= 9/8
= 1 1/8
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