y2+7y=18 y2+7y-18=0 (y+9)(y-2)=0 y=-9 & y=2
(y - 8)(y + 1)
(y + 3)(y - 10)
That factors to y(y2 + 7y - 5)
(y + 5) (y + 2)
(x - y + 7)(x + y)
y4 - 256 = (y2 - 16)(y2 + 16) = (y - 4)(y + 4)(y2 + 16)
x = 1 / y2 where: x is the dependent variable y is the independent variable
Terme und variablen (2)
x2 +y2 = R2 =16 = radius 2 R = 4
I think you have missed out an equals sign. If you mean x2 + y2 = 16, then the radius is 4.
y2 + 8y + 16 = y2 + 4y + 4y + 16 = y(y + 4) + 4(y + 4) = (y + 4)(y + 4) or (y + 4)2