A2-b2=9,ab 3 a+b=?.......
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Answer: 15
Step-by-step explanation:
a²-b² = 9
ab= 3
To find
a+b= ?
a²-b² = (a+b) (a-b)
a²-b²= 3 × 3
a+b =3
(a+b)² = a²+b²-2ab
=> 9 = a²+b²-6
=>a²+b² = 15
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