Question

Area of rectangle is x×x+7x+12 ,breath is x+3.find it's length

Answer 1

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Answer 2

x²+7x+12 
=x² +4x+3x+12
=x(x+4)+3(x+4)
=(x+4)(x+3)----(1)
area of the rectangle = (x²+7x+12)
lb = (x+4)(x+3)
therefore
l= x+4