Jawab:

Daerah asal =   -∞ < x <∞

Daerah hasil =  f(x) ≤ -3

Penjelasan dengan langkah-langkah:

Diketahui parabola yg melewati

(-2, -7)  (0, -3)  (2, -7)

Model pers kuadrat parabola

y = ax² + bx + c

maka

-7 = (-2)²a - 2b + c  -->  -7 = 4a - 2b + c

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-7 = (2)²a + 2b + c ---> -7 = 4a + 2b + c

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-3 = c  --> c = -3

maka

-7 = 4a - 2b + (-3)  -->  4a-2b = -7+3

-7 = 4a + 2b + (-3)  -->  4a+2b = -7+3

maka

4a-2b = -4

4a+2b = -4

---------------- +

8a       = -8

• a = -1

Cari b

4(a)+2b = -4

4(-1)+2b = -4

-4+2b = -4

2b = -4+4

2b = 0

• b = 0

Maka pers. =

y = ax² + bx + c

y = -x² + 0x - 3

f(x) = -x² - 3

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Domain = -∞ < x <∞

Range.. y kurang dr -3

Range = f(x) ≤ -3

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