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Given. Area of poster =3840c*m^(2)Let height =xc*m and width is ' yccmA=3840c*m^(2)=>xy=3840=>y=(3840 )/(x)" (i) "Printed area.{:[:'A_(1)=x_(1)y_(1)],[x_(1)=x-10-10=x-20],[y_(1)=y-6-6=y-12]:}so, quadA_(1)=(x-20)(y-12)From equation (i){:[" From equation (1) "],[qquad{:[A_(1)=(x-20)((3840 ... See the full answer