Question

ajutatima,multumesc!
dati clic pe poza

Answer 1

6. a) $(x+7y)^{2}$

b) $(11a-5x)^{2}$

c) (ab-xy)(ab+xy)

d) $(x+2yz)^{2}$

e) $(13y-1)^{2}$

f) (2x-17)(2x+17)

7. a) (21-20)(21+20)=1*41=41
b) (3,5-2,5)(3,5+2,5)=1*6=6
c) (114-14)(114+14)=100*128=12800
d) (1990-990)(1990+990)=1000*2980=2980000

8. a) 13=4+9=$2^{2} + 3^{2}$

b) 17=1+16=$1^{2} + 4^{2}$

c) 25=9+16=$3^{2} + 4^{2}$

d) 34=9+25=$3^{2} + 5^{2}$

e) 169=25+144=$5^{2} + 12^{2}$

9. a) 4$x^{2}$+16=$(2x)^{2} + 4^{2}$

b) 9$x^{2}$+25$y^{2}$=$(3x)^{2} + (5y)^{2}$

c) $x^{2}$+2x+1+$y^{2}$=$(x+1)^{2} + y^{2}$

d) $x^{2}$+$y^{2} -6y+9$=$x^{2} + (y-3)^{2}$