a 30kg weight is positioned 2m from a fulcrum. At what distance must a 40 kg weight be positioned to keep the scale balanced?

(w – 2.5)(w + 2.5)

(–4v – 9)(–4v + 9)

step-by-step explanation:

for this case we must apply distributive property to the following expression:

the distributive property states that:

then, when applying the property we have to multiply the -2 for each term within the parenthesis: