Aptitude - Decimal Fraction - Discussion
Discussion Forum : Decimal Fraction - General Questions (Q.No. 1)
1.
| Evaluate : | (2.39)2 - (1.61)2 |
| 2.39 - 1.61 |
Answer: Option
Explanation:
| Given Expression = | a2 - b2 | = | (a + b)(a - b) | = (a + b) = (2.39 + 1.61) = 4. |
| a - b | (a - b) |
Discussion:
21 comments Page 3 of 3.
Ishita said:
1 year ago
(2.39)²–(1.61)² so it is in the form of a²–b² so it will be( a+b)(a-b) so it will be (2.39+1.61)(2.39-1.61) so by solving we get
2.39 +1.61 =4.00 and 2.39-1.61= 0.78.
Now as in down i.e denomination also 2.39-1.61 is given which is 0.78.
So, we can cut the numerator and denominator i.e
(4.00×0.78)/0.78 = 4 if we cut the numerator 0.78 and denominator 0.78.
So here comes the answer. 4.
2.39 +1.61 =4.00 and 2.39-1.61= 0.78.
Now as in down i.e denomination also 2.39-1.61 is given which is 0.78.
So, we can cut the numerator and denominator i.e
(4.00×0.78)/0.78 = 4 if we cut the numerator 0.78 and denominator 0.78.
So here comes the answer. 4.
(13)
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