length=3x+1 breath=5-x find area of rectangle
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area of rectangle=1/2length×breath
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Area of rectangle is length x breath
= (3x+1)(5-x)
=15x-3x^2+5-x
=14x-3x^2+5
=-(3x^2-14x-5)
=-(3x^2+15x-x-5)
=-3x^2-15x+x+5
=-3x(x+5)+1(x+5)
=-(3x-1)(x+5).
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