The expression (12.86 × 12.86 + 12.86 × p + 0.14 × 0.14) will be a perfect square for p equal to	Choose the correct choice from the following answers.
A) 0.28 B) 0.26 C) 1 D) 0 E) 2

Rationale: explanation : 12.86 × 12.86 + 12.86 × p + 0.14 × 0.14 = ( 12.86 ) 2 + 12.86 × p + ( 0.14 ) 2 this can be written as ( 12.86 + 0.14 ) 2 = 132 , if 12.86 × p = 2 × 12.86 × 0.14 i . e . , if p = 2 × 0.14 = 0.28 hence , p = 0.28 . answer : option a
Answer: A