MHT CET202019 Oct 2020Morning ShiftMathematicsDefinite IntegrationActual
If ₁^ k (3 x²+2 x+1 ) d x=11 , then k =
Options
- A1 2
- B-2
- C- 1 2
- D2
Correct answer
D. 2
Step-by-step solution
(C) We have [3 ( x³ 3 )+2 ( x² 2 )+x ]₁^ k =11 [x³+x²+x ]₁^ k =11 (k³+k²+k )-(1+1+1)=11 k³+k²+k=14 k ( k ²+ k +1 )=2 7 k =2