Question

A bedroom is initially square-shaped with each side x feet long. The room is

then expanded so that the length of the room is increased by 3 feet, and the
width increased by 4 feet. Choose the expression which represents how much
bigger the area of the new bedroom is than the old bedroom.

Answer 1

7x+12

Explanation:

length=x

width=x

area=x²

new length=x+3

width=x+4

area=(x+3)(x+4)=x²+7x+12

increase in area=x²+7x+12-x²=7x+12