The question must be 3x² + 5x + 2
Explanation:

Here, the coefficient of x² is 3 and it is not a perfect square.
Therefore, multiply the equation throughout by 3.

Now, half of the coefficient of x is 5/2.
Therefore b = 5/2 and b² = (5/2)²
And the given picture is the further solution...
Hope it helps :)