I. x2=729 II. y=√729
I.x2+x−20=0 II.y2−y−30=0
I.x2+9x+14=0
II.y2+y−2=0
I.4x2=49 II.9y2−66y+121=0
I.9x2−18+5=0
II.2y−9y+10=0