Question

( l + m )² - ( l - m )²​

Answer 1

Answer: 4m

pls refer my attachment

hope it helps✌✌

Answer 2

Explanation:

Distribute all of the parentheses as shown below:

(l + m)(l + m)

Multiply the l first

l * l = l^2

Now the m

l * m = lm

Now the second m

m * l = lm

Again.

m * m = m^2

Write it as one equation

$l^2 + m^2 + 2lm$

Now distribute the negative sign for the second equation

-(l - m) becomes (-l + m)^2

Distribute

(-l + m)(-l + m)

Distribute the l and so forth

(-l * -l) = l^2

-lm

-lm

m^2

Write it as one equation

$l^2 + m^2 - 2lm$

Combine both equations and add like factors

$l^2 + m^2 + 2lm + l^2 + m^2 - 2lm$

Thus:

$2l^2 + 2m^2$

Remove the gcf, the gcf is always located outside:

$2(l^2 + m^2)$

Answer:

$2(l^2 + m^2)$