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can someone help me plz...last problem

simplify

(7 + radical (5))(7- radical (5))

for this one i have no idea

(a+b)*(a-b)= a^2 - b^2

memorize that, it is the factors of the difference of squares.

In this case, a=7, b= sqrt5

so, it simplifies to 49-5=44

So , i don't always have to leave it in a radical form for the answers?

No, you don't always have to leave the answer in radical form. Simplifying the expression typically involves getting rid of any radicals or irrational numbers if possible. In this case, using the difference of squares formula, we were able to simplify the expression to the integer value of 44. However, there may be cases where the radical cannot be simplified further and it is appropriate to leave the answer in radical form. It depends on the specific problem and what the instructions or requirements are.