Question

Ada yang bisa bantu???​

Answer 1

Jawaban:

no 9

f(x) = 3x^2 + x + c

3 = 3(-2)^2 + (-2) + c

3 = 12 - 2 + c

3 = 10 + c -> c = -7 (D)

no 10

f(x) = x^2 + bx + c

titik (1,-1) -> -1 = 1 + b + c

-> b + c = -2 ..... (1)

titik (2,-3) -> -3 = 4 + 2b + c

-> 2b + c = -7 .... (2)

eliminasi pers (1) dan (2)

b + c = -2

2b + c = -7

____________ -

-b = 5 -> b = -5

b = -5 maka b + c = -2

-5 + c = -2 -> c = 3

Jdi, b dan c adl -5 dan 3 (B)