Question 126896
first plug in the -3 in place of the x

3(-3)+7=
then multiply the
3 and -3.
(remember: when you multiply
two negative numbers the answer is positive.
when you multiply 
two postive numbers the answer is positive.
when you multiply
one positive number and one negative number the answer is negative.
these rules apply for division as well.)
-9+7=-2
the answer is negative 
because, of the two numbers 
you are adding, if the bigger number is 
negative then the answer is going to be 
negative as well.