Question

Help with math problem?

Answer 1

The delta sign is a new kind of operation. Your second line describes what it does.

So all you have to do is : \(4~ \Delta~5=4\cdot5+5=...\)

Answer 2

In words: if you have to "delta" two numbers, just multiply them and then add the second one to that result.

Answer 3

@Powerful22: does this help?