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$a-b=4$ এবং $ab=60$ হলে, $a+b$ এর মান কত?

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দেওয়া আছে,
$a-b=4$ এবং $ab=60$

আমরা জানি,
$(a-b)^2=(a+b)^2-4ab$

বা, $(a+b)^2=4^2+4\cdot60$

বা, $(a+b)^2=16+240$

বা, $(a+b)^2=256$

বা, $a+b=\sqrt{256}$

$\therefore a+b=16$ [Answer]

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