光化學煙霧的動力式

ax平方 + {ay+b}x -b z = 0

a x^2 + (ay+b) x - b z = 0

x^2 + (y+b/a) x - (b/a) z = 0

[x+(1/2)(y+b/a)]^2 - (1/4) (y+b/a)^2 - (b/a) z = 0

[x+(1/2)(y+b/a)]^2 = (1/4) (y+b/a)^2 + (b/a) z

x = - (1/2)(y+b/a)] +/- (1/2) sqrt[ (y+b/a)^2 + 4 (b/a) z ]

感謝啦!!
原來還是有要背的~.~

配方法.
x^2+Ax+B = (x+A/2)^2-A^2/4+B