Question

find the point which is at 90°

Answer 1

a is the correct answer

Answer 2

Answer:

$x = 3 \: \: \: \: \: \: \: \: x {}^{2} + y {}^{2} = 8$

x²+y²=8

c(0,0) r2√2

$\huge\mathcal\blue{Director\: Circle}$

C(0,0) R=√2r=√2.2√2=4

DC :(x-0)²+(y-0)²

=R²=16

=⏩r²+y²=16

P(n,k) lie on l:x=3 and DC : a²+y²=16

✔n=3.

⏩(3,±√7) or(3,+√7)

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✔ n²+k²=16

⏩9+k²=16.

k²=7

k= ±7