Question

Write a simplified polynomial expression for the area of a rectangle L=x^+4x-5 and the W=2x+1

Answer 1

Area of a rectangle is L*W
So\[ A=(x^2+4x-5)(2x+1)\]
Now Foil and simplify

Answer 2

first of all multiply both of them we will get this eq.
2x^3+x^2+8x^2+4x-10x-5