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area = l* b
105 = 4x-5* 2x-5
105 = 8x^2 -20x -10x +25
105 = 8x^2 -30x +25
105-25 = 8x^2 -30x
80= 8x^2 - 30x
8x^ - 30x -80=0
solving this quadratic equation
x= 5.5 and x= -1. 8
therefore x= 5.5
perimeter= 2( l+b)
= 2( 4x-5+ 2x-5)
= 2( 6x)
= 12x
= 12* 5.5
= 66cm
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