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

Evaluate

(l + m)^{2} - (l - m)^{2}

Expand the expression

l^{2} + 2 l m + m^{2} - (l - m)^{2}

Expand the expression

l^{2} + 2 l m + m^{2} - l^{2} + 2 l m - m^{2}

The sum of two opposites equals 0

More Steps

0 + 2 l m + m^{2} + 2 l m - m^{2}

Remove 0

2 l m + m^{2} + 2 l m - m^{2}

Add the terms

More Steps

4 l m + m^{2} - m^{2}

The sum of two opposites equals 0

More Steps

4 l m + 0

Solution

4 l m

Simplify the expression