1) 4(2t+1)-7(t-3)= 8t+4-7t+21=t+25
2)Aₓ=(x²+2x²+3x²):(8x-5x)-1=6x²:3x-1=2x-1
A(√2+1/2)=2×(√2+1/2)-1=2√2+1-1=2√2
3.N=(t+1)²-t(t+2)=t²+2t+1-t²-2t=1
4. p: (x+3)²=x²+9
(x+3)²=x²+6x+9 deci propozitia este falsa
5.n=(3/√3+1)²+(1-√3)²=(√3+1)²+(1-√3)²=3+2√3+1+1-2√3+3=8 n∈N
6.
a)4x-8y=4(x-2y)
b)3x(x+1)+6(x+1)=(x+1)(3x+6)=3(x+1)(x+2)
c)t²-121=(t-11)(t+11)
d)x⁴-2x²+1=(x²-1)²=(x-1)²(x+1)²
