SOLUTION: Complete the square and write the equation in standard form. Then give the center and radius of the circle. x2 + 18x + 81 + y2 - 8y + 16 = 81

Algebra ->  Graphs -> SOLUTION: Complete the square and write the equation in standard form. Then give the center and radius of the circle. x2 + 18x + 81 + y2 - 8y + 16 = 81       Log On


   

Question 1179456: Complete the square and write the equation in standard form. Then give the center and radius of the circle.
x2 + 18x + 81 + y2 - 8y + 16 = 81

Answer by josgarithmetic(39613) About Me  (Show Source):
You can put this solution on YOUR website!
x%5E2+%2B+18x+%2B+81+%2B+y%5E2+-+8y+%2B+16+=+81

You could start, this way:
x^2+18x+81, etc. but in your equation example, completing the square is not needed. LOOK -
%28x%5E2%2B18x%2B81%29%2B%28y%5E2-8y%2B16%29=81------you see, two square trinomials. FACTORIZE EACH!