Rozłoz wielomian na czynniki   4y(x²-2x+5) -3(-x²y+2xy-5y)=   Zapisz wielomian w postaci iloczynu   (a-b)²-9(2a+b)²

4y(x²-2x+5)-3(-x²y+2xy-5y)= 4y(x²-2x+5)+3y(x²-2x+5)= (4y+3y)(x²-2x+5)= 7y(x²-2x+5) (a-b)²-9(2a+b)²= a²-2ab+b²-9(4a²+4ab+b²)= a²-2ab+b²-36a²-36ab-9b²= -35a²-38ab-8b²= -35a²-28ab-10ab-8b²= -7a(5a+4b)-2b(5a+4b)= (-7a-2b)(5a+4b)= -(7a+2b)(5a+4b)