Question

the lenght of the rectangle below is (2×+3) and the width is (2×-3)find the area of the rectangle​

Answer 1

$area \: = l \times b \\ = (2x + 3) \times (2x - 3)$

Using identity (a+b)(a-b)= a²-b²

=(2x)²-(3)²

=4x²-9

Answer

Area = 4x²-9