Question

What is the value of the expression below when x = –2?

5 + 3(x – 7) – (x + 1)

A.
–5

B.
–7

C.
–21

D.
–23

Answer 1

5+3 (x-7)-(x+1)
5+3 (-2-7)-(-2+1)
5+3 (-9)-(-1)
5+3 (-9)+1
5+-27+1
5-27+1
-22+1
-21
C