simplifying expressions

[wjweaver]

√-8√-24

-8-8i
1+2i got this far with it (-8-8i)(1-2i)
(1+2i)(1-2i) usedfoil method

= -8+16i -8i +16i²
1²-4i<sup>2

need help:sad:</sup>

 

[tkhunny]

i^2 = -1 -- Substitute

16i - 8i = 8i -- This is simpler.

 

[lookagain]

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