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Mathematics 19 Online
OpenStudy (anonymous):

What choice is equivalent to the expression below? sqr root of -125 A. -5i sqr root 5 B. 5i sqr root 5 C. sqr root 125 D. -5i E. 5i sqr root -5

OpenStudy (bahrom7893):

B

jhonyy9 (jhonyy9):

B. because for sign minus we know that i^2 =-1 and in this way sqrt(-1) is i ---- and for 125 what equal 25*5 and sqrt(25*5)=5sqrt5 ----- so in this way we will get 5isqrt5 what is B.

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