Factorise y 2 + 3 /2 root5y -5
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y² +3/2 √5 y -5
= y² + 2√5y -(1/2 )√5 y -5
=y(y +2√5) -(1/2)√5(y +2√5)
=(y+2√5)[y -(1/2)]
=(1/2)(y+2√5)(2y-1)
= y² + 2√5y -(1/2 )√5 y -5
=y(y +2√5) -(1/2)√5(y +2√5)
=(y+2√5)[y -(1/2)]
=(1/2)(y+2√5)(2y-1)
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