Question

. If a^2 + b^2 = 40 and ab = 12, find a + b and a - b.
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Answer 1

(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