NDA2011MathematicsSequences and SeriesActual
What is the value of 8+2 8+2 8+2 8+ ?
Options
- A10
- B8
- C6
- D4
Correct answer
D. 4
Step-by-step solution
Let x= 8+2 8+2 8+2 8+ x= 8+2 x x^2=8+2 x x^2-2 x-8=0 x^2-4 x+2 x-8=0 array r x(x-4)+2(x-4)=0 (x-4)(x+2)=0 array aligned x & =4, x=-2 x & =4 aligned [ x 0]