Question

Tolong ya kak ... :)

Answer 1

#1

y = x² + 4x + 6

cara_1

x = -b/2a = -4/2.1 = -2

y = (-2)² + 4(-2) + 6 = 2

Puncak (-2,2)

cara_2

dg turunan

y' = 0

2x + 4 = 0

x = -2

y = 2

P(-2,2)

Berlaku cara yg sama utk soal yg lain :)

#2

segitiga dg sisi : 3,5,7

sudut A menghadap sisi 7 cm

sisi apit b dan c → 3 dan 5

cos A = (b² + c² - a²)/(2bc)

cos A = (3² + 5² - 7²)/(2.3.5)

cos A = -15/(2.15)

cos A = -1/2

A = 120°

sin A = 1/2 √3 ✔

Answer 2

Penjelasan dengan langkah-langkah:

dilampirkan pada gambarr :))