if a-b=2 and ab =15 find the value of (1)a+b , (2) a^2 -b^2 ,(3) a^2+b^2
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(a-b)²= (a+b)²- 4ab
2² = (a+b)²- 4 × 15
a+b = 8 ans (1)
a²-b²= (a+b) (a-b)
= 8 × 2 =16 ans (2)
(a+b)² = a² +b² +2ab
a²+b² = 64 -2×15
= 64 –30= 34 ans (3)..
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