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Type your answer here. Find the radius for a circle with the equation x2 plus y2 equals 9? ..
x=-1
3 (which is the sqrt of 9)
x2 - 4x - 9 = 0 ∴ x2 - 4x = 9 ∴ x2 - 4x + 4 = 13 ∴ (x - 2)2 = 13 ∴ x - 2 = ±√13 ∴ x = 2 ± √13
x2-7x-18 (x-9) (x+2) x=9 x=-2 X= either 9 or -2