Mr johnson sells erasers for $3 each he's old 96 erasers last week and he sold 204 erasers this week

it will cost dollar $540

the living room is 3 which means if we divide 325/3 then we get $108

therefore if 1part of the living room cost $108 and 3 costed $325

then total 5part of the room will cost 5*108 which gives $540

(5x-1)^2= (5x)^2-2(5x)×1+(1)^2=25x^2-10x+1