. If a^2 + b^2 = 40 and ab = 12, find a + b and a - b.
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(a+b)²=a²+b²+2ab
a+b = √{40+24}
a+b=±8
again , for second part
(a-b)² = a²+b²-2ab
a-b =√{40-24}
a-b = ±4
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