The expression (11.98 × 11.98 + 11.98 × x + 0.02 × 0.02) will be a perfect square for x equal to Select the correct option:
A) 0.02
B) 0.2
C) 0.04
D) 0.4
E) 4

Rationale: "solution given expression = ( 11.98 ) 2 + ( 0.02 ) 2 + 11.98 × x . for the given express to be a perfect square , we must have 11.98 × x = 2 × 11.98 × 0.02 or x = 0.04 . answer c"
Answer: C