Question

How you express four less than a the square of a number

Answer 1

The answer to your question is (x^ 2) - 4

Answer 2

Express 4 less than a number is actually easy.
X will be our number.
But it won't be just X, it would be X squared or x^2.
So you do... (x^2)-4.
(The 4 is what you subtract).