INTERVAL FUNGSI NAIK/TURUN
1. Grafik fungsi y = x^2 + 4x + 1 naik pada interval ....
y = x² + 4x + 1
y' = 2x + 4
Naik saat y' > 0
2x + 4 > 0
2x > -4
x > -2 ✔
2. Grafik fungsi y = mx + 2 akan selalu naik apabila ....
y = mx + 2
y' = m
m > 0 ✔
3. Grafik fungsi y = x^3 - 3x^2 - 72x + 1 turun pada interval...
y = x³ - 3x² - 72x + 1
y' = 3x² - 6x - 72
Turun saat y' < 0
3x² - 6x - 72 < 0 [: 3]
x² - 2x - 24 < 0
(x - 6)(x + 4) < 0
x - 6 = 0
x = 6
x + 4 = 0
x = -4
-4 < x < 6 ✔
4.] Fungsi y = 1/3 x^3 - 3x^2 + 8x + 2 akan naik pada interval ...
y = ⅓ x³ - 3x² + 8x + 2
y' = x² - 3x + 8
x² - 6x + 8 > 0
(x - 4)(x - 2) > 0
x - 4 = 0
x = 4
x - 2 = 0
x = 2
x < 2 atau x > 4 ✔
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INTERVAL FUNGSI NAIK/TURUN
1. Grafik fungsi y = x^2 + 4x + 1 naik pada interval ....
y = x² + 4x + 1
y' = 2x + 4
Naik saat y' > 0
2x + 4 > 0
2x > -4
x > -2 ✔
2. Grafik fungsi y = mx + 2 akan selalu naik apabila ....
y = mx + 2
y' = m
Naik saat y' > 0
m > 0 ✔
3. Grafik fungsi y = x^3 - 3x^2 - 72x + 1 turun pada interval...
y = x³ - 3x² - 72x + 1
y' = 3x² - 6x - 72
Turun saat y' < 0
3x² - 6x - 72 < 0 [: 3]
x² - 2x - 24 < 0
(x - 6)(x + 4) < 0
x - 6 = 0
x = 6
x + 4 = 0
x = -4
-4 < x < 6 ✔
4.] Fungsi y = 1/3 x^3 - 3x^2 + 8x + 2 akan naik pada interval ...
y = ⅓ x³ - 3x² + 8x + 2
y' = x² - 3x + 8
Naik saat y' > 0
x² - 6x + 8 > 0
(x - 4)(x - 2) > 0
x - 4 = 0
x = 4
x - 2 = 0
x = 2
x < 2 atau x > 4 ✔