Answer is provided as -1, why not +1?

Question

Comments

Please attach the image correctly or enter the question manually.Its difficult to read your question.

Answer 1

i think answer should be +1 or -1  lamda can take both values

Comments

on lamda=+1, the rank will become '2' and therefore no. of independent solutions will become n-r=3-2=1, which is wrong because in qsn it is given two independent solutions are there...

---

yes u are right