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The expression (11 98 11 98 + 11 98 X +...

This question belongs to Arithmetic Ability Decimal Fraction
Decimal Fraction
?

The expression (11.98 × 11.98 + 11.98 × X + 0.02 × 0.02) will be a perfect square for X equal to:

Answer & Solution
Correct Answer: Option C
Given expression = (11.98)2 + (0.02)2 + 11.98 × X
For the given expression to be a perfect square,
(a + b)2 = a2 + b2 + 2ab
we must have
11.98 × X = 2 × 11.98 × 0.02
∴ X = 0.04
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1 Comment
Avancha Vamshi
Avancha Vamshi 7 years ago
Please explain it clearly with formula based u do this problem I didn't get in this how the multiple of 2 and how addition multiple convert to multiple
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