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R= p 2
0 q
I
R² = R . R = p 2 ! p 2 = p 2p+2q = 1 0
0 q ! 0 q 0 q² 0 1
diperoleh p=1 q=-1
S = 3 -1
-2 -5
S² = p S + I
3 -1 ! 3 -1
-2 -5 ! -2 -5 = 3. 3+ 1 . 2 3(-1)+1.5 = 11 2
(-2)3+2 . 5 2 . 1+5 .5 4 25
pS +I = p 3 -1 +q ! 1 0 = 3p+q -p
-2 -5 ! 0 1 = -2p -5p +q
jadi p = -2 dan 3p+q=11 ..... 3(-2) + q =11 .... q= 15
p =
3