Jawab:
Yo ndak tahu kok tanya saya?

Penjelasan dengan langkah-langkah:
Yo ndak tahu kok tanya saya?
(Xcvi)

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Just kidding
Jawab:
(1.) --> There are 2 pairs of two numbers:
{3, 27} and {27, 3}
(2.) --> There are 2 pairs of two numbers:
{-15, -5} and {15, 5}

Penjelasan dengan langkah-langkah:
(1.) a+b = 30, ab = 81  ->  b = 81/a
a + (81/a) = 30  ->  (a²/a) + (81a/a) = (30a/a)
a² + 81 = 30a  ->  a² - 30a + 81 = 0
Aa² + Ba + C = 0  ∴  A = 1, B = -30, C = 81
p and q are roots, pq = C/A, p+q = -B/A
pq = 81/1,  p+q = -(-30)/1  ; therefore ,
pq = 81,  p+q = 30   ∴    p = 27, q = 3
a+b = 30, ab = 81 (same)  p = 3, q = 27
--> There are 2 pairs of two numbers:
{3, 27} and {27, 3}

(2.) a/b = 3  ->  a = 3b
ab = 75, b(3b) = 75, 3b² = 75
b = √(75/3),  b = √25,   b = ±5
b = {-5, 5}
a = 3b,   a = {3(-5), 3(5)}
a = {-15, 15}
--> There are 2 pairs of two numbers:
{-15, -5} and {15, 5}

(xcvi)