Question

Помогите с решением y²-9y+8

Answer 1

y²-9y+8 = y²-2*4,5y+4,5²-4,5²+8 = (y-4,5)²-4,5²+8 = (y-4,5)²-20,25+8 = 
(y-4,5)²-12,25 = (y-4,5)²-3,5² = (y-4,5-3,5)(y-4,5+3,5) = (y-8)(y-1).