Răspunsuri

2014-09-06T20:37:31+03:00
1)x²+2x+1-9=x²+2x-8
2)x²+10x+25-25y²

Pai si pe asta (x+1)²-9 =?
e la fel
Aa scz m.am prostit :)))
nu.i nimik
:3
2014-09-06T20:43:22+03:00
(x+1)²-9= x²+2x+1-9= x²+2x-8= x²+2(x-4) 

(x+5)²-25y²= x²+10x+25-25y²= x(x+5) +(5-5y)(5+5y)