Which of the following expressions is equal to 3x^2+27

Question

How do I find the answer to this question 3x^2+27

Answer 1

As Arturo and Mark noted in the comments, you did not provide the list of equivalent expressions or state what was to be done. But since the expression is factorable, I'm guessing that's what they want you to do:

3x² + 27

3(x² + 9)

Now (x² + 9) is a sum of squares (9 = 3²). Use the sum of squares formula: (x² + a²) = (x+ia)(x-ia) to complete the factoring. Can you finish it from here?