Question

Area of a square is (49 m2 -84mn+36nsq)sq units
Find its perimeter.
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Answer 1

Answer is in attachment mate

Answer 2

Answer:

± (28m-24n)

Step-by-step explanation:

Let the side of the square be a

A/Q:

a²=49m²-84mn+36n²

a²= (7m)²-2(7m)(6n)+(6n)²-------(i)

We know that:   (x-y)²=x²-2xy+y²------(ii)

Compairing (i) and (ii)

a²=(7m-6n)²

a= ±(7m-6n)

Now perimeter of the square = 4×a

= 4×{±(7m-6n)}

= ±(28m-24n)

Hence proved!