Posted by **Kim** on Saturday, September 3, 2011 at 12:15am.

Write the rectangular equation (x+7)^+y^=49 in polar form.

- Precalculus -
**Bosnian**, Saturday, September 3, 2011 at 7:58am
In google type:

Write the rectangular equation (x+7)^+y^=49 in polar form

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- Precalculus -
**Reiny**, Saturday, September 3, 2011 at 8:08am
You should know that

r^2 = x^2 + y^2 and sinØ = y/r , and cosØ = x/r

so for

(x+7)^+y^=49

x^2 + 14x + 49 + y^2 = 49

r^2 + 14rcosØ = 0

or

r(r + 14cosØ) = 0 or r^2 = - 14r cosØ

or

r = 14cosØ , r ≠ 0

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