Разложить на множители : y^2-x^2-6x-9
у²-х²-6х-9=у²-(х²+6х+9)=у²-(х+3)²=(у-(х+3))(у+(х+3))=(у-х-3)(у+х+3)
(y-x-3)(y+x+3)
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у²-х²-6х-9=у²-(х²+6х+9)=у²-(х+3)²=(у-(х+3))(у+(х+3))=(у-х-3)(у+х+3)
Verified answer
Y^2-x^2-6x-9(y-x-3)(y+x+3)