Question

ajutatima,multumesc!
dati clic pe poza

Answer 1

6
a)  x²+14xy+49y²=(x+7y)²
b)121a²-110ax+25x²=(11a-5x)²
c)a²b²-x²y²=(ab-xy)(ab+xy)
d)x²+4xyz+4y²z²=(x+2yz)²
e)169y²-26y+1=(13y-1)²
f)4x²-289=(2x-17)(2x+17)

7) a) 21²-20²=(21-20)(21+20)=41
b)3,5²-2,5²=(3,5-2,5)(3,5+2,5)=6
c)114²-14²=(114-14)(114+14)=100×128=12800
d)1990²-990²=(1990-990)(1990+990)=1000×2980=2980000