Let us first resolve the given numbers into prime factors.
By prime factorization,
√8 = √( 2 × 2 × 2)
√8 = 2√2
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
√98 = √( 2 × 7 × 7)
√98 = 7√2
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
√32 = √( 2 × 2 × 2 × 2 × 2)
√32 = 2 × 2√2
√32 = 4√2
According to the question,
√8+√98+√32
2√2 + 7√2 + 4√2
√2(2 + 7 + 4)
√2(13)
13√2
So, we get that :
√8+√98+√32 → 13√2