x^2-25-x^2+10x-25=10x-50
(х+5)(х-5)-(х-5)² = (х-5)( х+5-(х-5) ) = (х-5)( х+5- х+5) = (х-5)*10 = 10х -50
x^2-25-x^2+10x-25=10x-50
(х+5)(х-5)-(х-5)² = (х-5)( х+5-(х-5) ) = (х-5)( х+5- х+5) = (х-5)*10 = 10х -50