Question

find the area of rentangle 4a+b a+b​

Answer 1

if you mean length is 4a+b and width a+b

then,

Area of rectangle = L*B

= (4a+b)(a+b)

= 4a(a+b)+b(a+b)

= 4a²+4ab+ab+b²

= 4a²+5ab+b²

hope it helps you