Question

(2.5l-0.5m)×(2.5l+0.5m)

Answer 1

let 2.5l=a and 0.5 m = b
so the equation becomes, (a-b)×(a+b)


$(a - b)(a + b) = {a}^{2} - {b}^{2}$
${(2.5l)}^{2} - {(0.5m)}^{2}$
$6.25 {l}^{2} - 0.25 {m}^{2}$

Answer 2

(2.5l)^2-(0.5ml)^2
(2500ml)^2-(0.5ml)^2
6250000ml-0.25ml
6249999.75 ml

hope it helps ☺ ☺