the printed matter on a 10 by 16 centimeter page of a book must cover 0 square centinmeters. if all margins are to be the sme width, how wide should they be?
A = Area of the printed matter
w = width
a = 10 - 2 w
b = 18 - 2 w
( 10 - 2 w ) * ( 18 - 2 w ) = A
18 * 10 - 18 * 2 w - 2 w * 10 - 2 w * ( - 2 w ) = A
180 - 36 w - 20 w + 4 w ^ 2 = A
4 w ^ 2 - 56 w + 180 - A = 0
Are you sre that the printed matter of a book must cover 0 cm ^ 2 ?