Question:a - b = 4 এবং ab = 60 হলে a + b = কত? 

Answer দেওয়া আছে, a - b = 4 এবং ab = 60 এখন, `(a + b)^2 = (a - b)^2 + 4ab` `= (4)^2 + 4.60` [মান বসিয়ে] = 16 + 240 :. `(a + b)^2 = 256` বা, `a + b = +- sqrt(256)` :. `a + b = +- 16 ` (Ans) 

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a - b = 4 abong ab = 60 hole a + b = koto?
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