It seems like you're working with the function $f(x) = -3x^2 + 4x + 5$ and some additional terms like $f(x) - f$ and $f(x) = 2$, possibly related to a constraint. However, the notation you've provided is a bit unclear.

Could you clarify what you mean by:

1. $f(x) - f$: Is this subtraction of the function from a value or some other operation?
2. $f(x) = 2$: Are you setting $f(x) = 2$ as a condition or an equation you want to solve for $x$?
3. T = constriction: What does T refer to here? Is it another value or function you're working with?

Feel free to provide more context, and I can help break it down further!

Here's a possible interpretation:

If you're asking to find where $f(x) = 2$, we can solve the equation:

$-3x^2 + 4x + 5 = 2$

Subtract 2 from both sides:

$-3x^2 + 4x + 3 = 0$

Now, you can solve this quadratic equation for $x$.

Would you like me to go through the solution step-by-step?

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Here are some related questions that could expand on your current work:

1. How do you solve quadratic equations like $-3x^2 + 4x + 3 = 0$?
2. How do you apply constraints when working with functions in optimization problems?
3. What does the term "constriction" mean in the context of functions?
4. How can you analyze the behavior of a quadratic function for extreme values?
5. How do transformations (like shifting and scaling) affect the graph of quadratic functions?

Tip: When solving quadratic equations, it’s often helpful to use the quadratic formula $x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}$ for accurate and quick solutions!