Question

Va rog , este urgent.​

Answer 1

Salut.

Cunoaștem formula:

$\boxed{(a-b)^{2}=a^{2}-2ab+b^{2}}$

Prin urmare:

$\displaystyle{ (1- 5x)^{2}=1^{2}-2 \cdot 1\cdot 5x + (5x)^{2} }$

$\displaystyle{ =1 -2 \cdot 5x + 25 \cdot x^{2} }$

$\displaystyle{ =25x^{2}-10x+1 }$

Răspuns:

Varianta D

- Lumberjack25