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July 23, 2014

July 23, 2014

Posted by **confused-steve please** on Monday, December 3, 2012 at 11:34am.

2. write the equation of the circle in standard form. find the center, radius, intercepts.

x^2+y^2+16x-18y+145=25

please show work

- college algebra -
**Damon**, Monday, December 3, 2012 at 12:19pmparallel to y =7 is a horizontal line

y = 0x + 5

or y = 5

complete the square a couple of times

x^2 + 16 x = -y^2 + 18 y - 120

x^2 + 16 x + 64 = -y^2 + 18 y - -56

(x+8)^2 + y^2 - 18 y = -56

(x+8)^2 + y^2 - 18 y + 81 = 25

(x+8)^2 + (y-9)^2 = 5^2

center at (-8,9) radius 5 etc

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