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xxTIMURxx [149]
2 years ago
11

Is this a true statement X^2=1 if and only if x=1 or x=-1

Mathematics
1 answer:
Stells [14]2 years ago
4 0

Answer:

yes the statement is true

Step-by-step explanation:

if you plug in 1^2 you are just multiplying 1 by its self

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Step-by-step explanation:

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weeeeeb [17]
See diagram
I wrote that the degrees are 70 each because it is isocolese and 140/2=70


a.
to solve for the diagonal, I'm going to use trig to find the height and the base then use pythagorean theorem to find the diagonal

so
see I've drawn an auxiliry line to make a right triangle on the leftmost side
so
we want to find the height and base
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so 7sin(70°)=h≈6.57785

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now
the entire long base is 22, so that big triangle with the diagonal as the hyptonuse is 22-2.39414=19.6059
use pythagorean theorem, like 6.57785²+19.6059²=diagonal²
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b.
we got that the base was 7cos(70°)
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a. 20.68ft
b. 17.21ft

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3 years ago
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