a dan b memenuhi...
a.
a2 - b2
= 1
b. a2 + b2 + ab =
1
c. a2 + b2
- ab
= 1
d. ( a
- b )2 + ab = 3
e. ( a
+ b )2 – ab = 1
Pembahasan :
3log ( a3 –
b3 ) = 3log
( a - b
a3 – b3 = a – b
a3 – b3 = a – b
(a - b)3 + 3ab (a - b) = a -
b
(a – b) ((a – b)2 + 3ab) = a – b
(a – b)2 + 3ab = 1
a2 – 2ab + b2
+ 3ab = 1
a2 + b2
+ ab = 1
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