$\"\"$

The expression is 9 $\"\"$ 49.

= 9(50 $\"\"$ 1) (Write 49 as the difference of 50 and 1)

Distribute terms using distributive property: a(b $\"\"$ c) = ab $\"\"$ ac.

= 9 $\"\"$ 50 $\"\"$ 9 $\"\"$ 1 (Distribute 9)

= 450 $\"\"$ 9 (Multiply: 9 $\"\"$ 50 = 450 and 9 $\"\"$ 1 = 9)

= 441 (Subtract: 450 $\"\"$ 9 = 441) $\"\"$

The product is $\"\"$ .