Is there anymore to the question so I can help
You our?
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➷ Just substitute the values in:
(1)^2 + (3)^2 + (4)^2 - 3(3)(4)^2
Simplify:
(1 + 9 + 16) - 144
Simplify further to get the answer:
answer = -118
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(10^2 +10^2)^.5 = 10*(sqrt2)
6
Like how

= 36
Square root does the opposite.
Edit: my mistake, it is 6