11
Type your answer here. Find the radius for a circle with the equation x2 plus y2 equals 9? ..
x=-1
x2 - 4x - 9 = 0 ∴ x2 - 4x = 9 ∴ x2 - 4x + 4 = 13 ∴ (x - 2)2 = 13 ∴ x - 2 = ±√13 ∴ x = 2 ± √13
3 (which is the sqrt of 9)
If: x2 = 81 Then: x = 9 or x = -9
x2 + 9 = 10x x2 - 10x + 9 = 0. (x - 9)(x - 1) = 0. Therefore, x = 1 or 9.
X2 or 2 times x?
11
x2 - 9 = 0Add 9 to both sides.x2 = 9Find the square root of both sides.x = ±3
Type your answer here. Find the radius for a circle with the equation x2 plus y2 equals 9? ..
x=-1
9
x2+24x+144 = 9 x2+24x+144-9 = 0 x2+24x+135 = 0 (x+9)(x+15) = 0 x = -9 or x = -15
x2 = 81 Square root both sides:- x = +/- 9
3
Divide both sides of the equation by x: x2 = 9x x2 / x = 9x / x x = 9