Jawaban:
no 6
f(x) = 2(x^2 - 6x + 9) + 5
= 2x^2 - 12x + 18 + 5
= 2x^2 - 12x + 23
a = 2, b = -12, c = 23
a + b + c = 2 - 12 + 23 = 13 (A)
no 7
misal opsi A(-1,2)
2 = 1 + 2 - 5
2 = -2 (salah)
opsi B(0,-5)
-5 = -5 (benar) -> (B)
no 8
f(x) = 2 x^2 - x + 4
a = 2(3)^2 - 3 + 4
= 18 + 1 = 19 (A)
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Jawaban:
no 6
f(x) = 2(x^2 - 6x + 9) + 5
= 2x^2 - 12x + 18 + 5
= 2x^2 - 12x + 23
a = 2, b = -12, c = 23
a + b + c = 2 - 12 + 23 = 13 (A)
no 7
misal opsi A(-1,2)
2 = 1 + 2 - 5
2 = -2 (salah)
opsi B(0,-5)
-5 = -5 (benar) -> (B)
no 8
f(x) = 2 x^2 - x + 4
a = 2(3)^2 - 3 + 4
= 18 + 1 = 19 (A)