What is the answer for 2c squared plus 10c-48?

Answer 1

[ 2c2 + 10c - 48 ] is not a question. It's just an expression that stands for a

number, and we can't tell what the number is until we know what 'c' is.

If you said it was equal to something, then you'd have an equation, and you could

ask "What number does 'c' have to be in order to make this equation true ?"

But without an 'equals' sign ( = ) in it, it's not a question, and has no answer.