What is the value of the expression #7 + 2(x-9)-(x+2)# when #x=-3#?

1 Answer
Apr 23, 2016

#-16#

Explanation:

To solve this, we['ll use what is known as substitution, where we replace something with something that we know. In this case, wherever we see #x#, we replace it with a #-3#:
#7+2(x-9)-(x+2)=7+2((-3)-9)-((-3)+2)#
#=7+2(-12)-(-1)#
#=7-24+1#
#=-16#