Answer:
Completing the square.
Step-by-step explanation:
since there is no "a" term and the bx term is even, completing the square is your best bet.
For this case we have as a simpler method the factorization. We must find two numbers that multiplied as a result +3 and added as a result +4.
These numbers are:
3 and 1.[tex]3 + 1 = 4\\\\3 * 1 = 3[/tex]
So, we have to:
[tex]x ^2 + 4x + 3 =\\(x + 3) (x+1)[/tex]
Answer:
[tex](x + 3) (x + 1)[/tex]
