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f(x) = -1/2 x^2 -4x - 6
digeser kekanan 5 satuan
x' = x + 5
x = x' - 5
memotong sumbu y di titik ...?
f(x) = -1/2 (x' - 5)^2 - 4 (x' - 5) - 6
= -1/2 (x^2 - 10x + 25) - 4x + 20 - 6
y = -1/2 x^2 + 5x - 25/2 - 4x + 14
= -1/2 x^2 + x + 3/2
memotong sumbu y maka x = 0
y = 0 + 0 + 3/2
= 3/2
= 1 1/2
memotong sumbu y di titik ( 0, 1 1/2)
jawaban C
no 10)
panjang kawat 200 meter
2 x lebar + 1 x panjang = 200
2l + p = 200
agar luas maksimum maka 2l = p
2l + p = 200
2p = 200
p = 100m
l = 50m
luas = 5000 m^2
jawaban C
10. C.
maaf klau slh