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The expression $(11.98\times 11.98 + 11.98 \times x +0.02 \times 0.02)$ will be a perfect square for $x$ equal to:

  1. $2.02$
  2. $0.17$
  3. $0.04$
  4. $1.4$
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Answer is C

Question is in the form of $a^{2}+2ab+b^{2}$. Here a = 11.98 and b = .02

Missing term in the expression 2ab = 2 * .02 * 11.98.

In order to make it as a perfect square =  2 * .02 = .04

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