Multiply negative root 8 4 and 6 plus root 6 4?

Answer 1

Root 64 is 8, if by root you mean the square root.

Then the problem become -square root 84(6+8) which

is the - square root of 84(14)

But square root of 84 is 2(square root of 21) so the final answer comes

from -2(square root 21)x14

which is -28square root (21)