Answer:
B
Step-by-step explanation:
The formula for area of a square is length x width. The x represents the width and the 7x is just the width times 7. this means the length is 7 times the width, If the width is x, then the length is 7x
7
AB = 3x-2
Let x=3
AB = 3*3 -2
= 9-2
=7
