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(3x - 1) (x + 5) ≥ 0
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- 5 1/3
Hp = { x / x ≤ - 5 atau x ≥ 1/3 ; x ∈ R }
2) f (x) = - 2x² + 6x + 20 ⇒ a = - 2 ; b = 6 ; c = 20
a) D = b² - 4.a.c
= 6² - 4.(- 2)(20)
= 36 + 160
= 196
b) titik potong pada sumbu y ⇒ x = 0
f (x) = - 2 (0)² + 6 .(0) + 20
y = 0 + 0 + 20
y = 20 ⇒ titik potong ( 0 , 20)
c) titik potong pada sumbu x ⇒ f (x) = 0
0 = - 2x² + 6x + 20
0 = x² - 3x - 10
0 = (x - 5) (x + 2)
x - 5 = 0 atau x + 2 = 0
x = 5 atau x = - 2
titik potont ( 5 , 0) dan ( - 2 , 0)
d) titik balik ( - b /2a , D/- 4a)
( - 6 / 2 . -3 , 196 / 4 . -3 )
( 9 , 16)
3) pertanyaan tidak ada
4) AP = √(10² + 5²)
= √(100 + 25)
= √125
= 5√5 cm