Question

If l=m+n,b=m-n,find the area of the room?

Answer 1

Hi there!

Your Answer :-

Area = L × B

L = m+n, B = m-n.

$\sf\red{(m + n)(m - n)}$

Use Identity a² - b² = (a+b)(a-b)

$\sf\blue{ {m}^{2} - {n}^{2} }$

So, your answer is m²-n²