Question

what is the perimeter of rectangle whose area is (x²-×-42 ) sq. units ?​

Answer 1

Answer:

perimeter =4x-2 units

Step-by-step explanation:

ans in image

Answer 2

Step-by-step explanation:

Let the lenghth of the required rectangle be l unit and breadth be b unit.

Area of the rectangle =lb unit²

A/q, x² - x -42= lb

or, x²-(7-6)x-42=lb

or, x²-7x+6x-42=lb

or, x(x-7)+6(x-7) = lb

or,. (x+6)(x-7)=lb

Therefore, length=x+6 and breadth = x-7

Now,

perimeter of the rectangle = 2(l+b)

=2(x+6+x-7).

=2(2x-1)

=4x-2.

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