-4
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'Product' means MULTIPLY.
When an expression is written as -7(-3) , it means that the '-7' is multiplied to the number inside the brackets.
Hence
-7 X -3 = (+) 21
NB In algebra the multiplication sign 'X' is never shown, as it may be confused with the unknown 'x'.
The product of -7 and -3 is the same as the product of +7 and +3. The product of two negative numbers is positive.
It is: 73 = 343
It is a product if it has a * sign in it.
73
4x + 9 = 73 4x = 64 x = 16
73 is 9 more than the product of 4 and 16