To simplify the expression \( x675 \times x453 \), we can factor out the common \( x \):
\[ x675 \times x453 = x \times 675 \times x \times 453 = x^2 \times 675 \times 453 \]
This doesn't reduce further where \( 675 \) and \( 453 \) are constants, but if you want the product of \( 675 \) and \( 453 \), we can calculate that separately:
\[ 675 \times 453 = 305775 \]
Thus, the simplified form of the expression is:
\[ x^2 \times 305775 \]
So the final answer is:
\[ x^2 \times 305775 \]