Question

Ajuta ti ma va rog la aceste exercitii nu inteleg nimic!! Dau coroana

Answer 1

Răspuns:

Explicație pas cu pas:

1. 4(2t-1)-7(t-3)=

8t-4-7t+21=

t+17

2. E(x)=(x+1)²-x(x+2)

E(x)=x²+2x+1-x²-2x=1 ∈N

3.

$n=(\frac{3}{\sqrt{3}}+1)^{2} +(1-\sqrt{3} )^{2} =(\sqrt{3} +1)^{2}+ (1-\sqrt{3} )^{2} =3+2\sqrt{3} +1+1-2\sqrt{3}+3=8$

8∈N

4. (x+2)²=6x+7

x²+4x+4-6x-7=0

x²-2x-3=0

Δ=4+12=16

$x_{1}=\frac{2+4}{2}=3\\x_{1}=\frac{2-4}{2} =-1$