No 13 dan penyelesaiannya :)
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f(x)= 5- 5 x + 2 x - 2x^2
f(x) = 5- 3x - 2 x ^2
krna fungsi kuadrat maka titik balik maksimum
( Xp, Yp)
Xp = -b/2a
Xp = --3/2 (-2)
Xp = - 3/4
untuk mencari yp masukkan xp ke persamaan
Yp = 5 - 3( -3/4)- 2 (-3/4)^2
Yp = 5+ 9/4 - 9/8
Yp = 5+ (18 -9 )8
Yp = 5 + 9/8
Yp = 49 /8
Yp = 6 1/8