Question

va rog exercitiile 12 si 15

Answer 1

ex15 a) (x-9y)²

b) (1/6x-3y)²

c) 2(2xy+x²+y²)=2(x²+2xy+y²)=2(x+y)²

d) -(16x²-24xy+9y²)=-(4x-3y)²....

ex12 a) √tot sub radical(82-18)×(82+18)=√tot sub radical64×100=8×10=80.

b) √tot sub radical(65-63)×(65+63)=√tot sub radical2×128=√256=16.

c) √tot sub radical(113-112)×(113+112)=√tot sub radical1×225=√225=15.

d) √tot sub radical(85-36)×(85+36)=√tot sub radical49×121=7×11=77.