Multiply. \[ (x+11)(x-11) \] \[ (x+11)(x-11)=\square \]

Step 1 ：Multiply the binomials (x+11) and (x-11) using the general formula for multiplying two binomials (a+b)(c+d) which is ac + ad + bc + bd. In this case, a=x, b=11, c=x, d=-11.

Step 2 ：Substitute the values into the formula to get: x*x + x*(-11) + 11*x + 11*(-11)

Step 3 ：Simplify the expression to get: \(x^2 - 121\)

Step 4 ：So, the final answer is \(\boxed{x^2 - 121}\)