Question

Ada yang bisa bantu???​

Answer 1

9.

f(x) = x² - 4x + 7

a = 1

b = -4

c = 7

x = -b/2a

x = -(-4)/2(1)

x = 4/2

x = 2

y = x² - 4x + 7

y = 2² - 4(2) + 7

y = 4 - 8 + 7

y = 3

koordinat titik balik (2, 3)

_____________________________

10.

f(x) = x² + bx + c

x = 3

-b/2a = 3

-b/2(1) = 3

-b/2 = 3

b = -6

f(x) = x² - 6x + c

f(3) = 5

3² - 6(3) + c = 5

9 - 18 + c = 5

-9 + c = 5

c = 5 + 9

c = 14

maka :

b = -6

c = 14