The value of (68.237)2 – (31.763)2 is : Pick:  A) 3.6474  B) 36.474  C) 364.74  D) 3647.4  E) None of these
Solution   Given expression = (a2 - b2) = (a + b)(a - b)   = (68.237 + 31.763) (68.237 - 31.763)   = (100 × 36.474)   = 3647.4. Answer 3647.4
<result>D</result>
The value of (68.237)2 – (31.763)2 is :