Question

Calculate the value of the expression

Answer 1

Answer:

$1.area \: = l \times b \\ =( 2x + y)(5x - 3y) \\ = 10 {x}^{2} - xy - 3 {y}^{2} \\ 2.area \: = \frac{1}{2} \times (5x - 4)(2x + 1) \\ = \frac{1}{2} \times (10 {x}^{2} - 3x - 4) \\ 3.area = {(5x)}^{2} \\ 4.area = 6x\pi$