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Dilatasi P(a,b) k
N (x,y) ---------------------> N' (k(x-a)+a, k(y-b)+b)
Rotasi π/2
N' (x',y') ----------> N'' (-y', x')
sehingga
P(2,1) k = 3
N (-1,-1) ----------------------> N' (3(-1-2)+2, 3(-1-1)+1) = N' (-7,-5)
π/2
N" (-7,-5) ---------------> N"' (5,-7)
18. 2x-1 > 0
2x > 1
x > 1/2 dan
2x-1 ≠ 1
2x ≠ 2
x ≠ 1
2x + 1 > x²+2x-3
x²+2x-3-2x-1 < 0
x²-4 < 0
(x-2)(x+2) = 0
x = 2 dan x = -2
_____-2______2_____
x =0, --> (0)²-4 = -4 --> negatif
++++ -2 ------ 2 +++++ , tanda < 0,
-2 < x < 2
irisan : x > 1/2, x≠ 1 dan -2 < x < 2
HP { 1/2 < x < 1, dan 1 < x < 2 }