-2
-1
1
2
Correct answer is D
√50−K√8=2√2
√50−2√2 = K√8
= √2×25−2√2
= K √4×2
5√21−2√2 = 2K√2
5√4−2√2=2K√2
10−2√2=2K√2
8√2=2K√21
= 2k√2×√2 = 8
2k √4 = 8
2k x 2 = 8
4k = 8
k = 84
k = 2
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