5m Zen
1 y2 2y
1 y2 2y pictures 5
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1 y2 2y
y2 2x 2y 1 0
ay a y2 2y 1
y2 2y 1 0
x2 y2 2y 1
factorise 2y3 y2 2y 1
y 1 )( y2 2y 2
y 1 )( y2 2y 1
x2 2x 1 y2 2y 1
y 1 )( y2 2y 4
1 y2 2y
