| Directions: What approximate value is come in place of question mark (?) in the given questions? (You are not expected to calculate the exact value.) [NICL (AO) 2014] |
| \[{{(?)}^{2}}+{{(79)}^{2}}={{(172)}^{2}}-{{(88)}^{2}}-8203\] |
A) 86
B) 89
C) 83
D) 81
E) 87
Correct Answer: A
Solution :
| \[{{(?)}^{2}}+{{(79)}^{2}}={{(172)}^{2}}-{{(88)}^{2}}-8203\] |
| \[\Rightarrow \]\[{{(?)}^{2}}+6241=29584-7744-8203\] |
| \[\Rightarrow \] \[{{(?)}^{2}}=29584-15947-6241\] |
| \[\Rightarrow \] \[{{(?)}^{2}}=7396\] |
| \[\Rightarrow \] \[?=86\] |
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