if (64)2 - (36)2 = 10x, then x = ?
Choose the correct choice from the following answers.
A) 200  B) 220  C) 210  D) 280  E) None of these
Explanation :   a2−b2=(a−b)(a+b)   (64)2 - (36)2 = (64 - 36)(64 + 36) = 28 × 100   Given that (64)2 - (36)2 = 10x   =&gt; 28 × 100 = 10x   =&gt; x = 280. Answer : Option 280
<result>D</result>
if (64)2 - (36)2 = 10x, then x = ?