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(x+1)²-9=?

(x+5)²-25y²=?

(x+1)²-9 =?

Va multumesc :*


Răspuns :

1)x²+2x+1-9=x²+2x-8
2)x²+10x+25-25y²

(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)