I am stuck with this question... Can anyone help please:

A rectangle is formed by doubling both the length and the width of a rectangle.

What is the area, in cm2, of this new rectangle?

the length is (a+3) cm

the width is 2 cm

Is the answer:

= 2(a+3) x 2squared

= 4 (2a + 6)

= 8a + 24 cmsquared