Question

(2l + 3m)2 – (2l– 3m)2​

Answer 1

Step-by-step explanation:

Let m=-9m=−9.

\frac{1}{3}(-9+21)+\frac{2}{3}\times -9=-2

3

1

(−9+21)+

3

2

×−9=−2

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Answer 2

Answer:

let a= (2l +3m) ^2

let b = (2l -3m)^2

(2l+3m) ^2 - (2l-3m) ^2. =a^2 -b^2

a^2 -b^2 =(a+b)(a-b)

=)(2l+3m)(2l-3m) = 4l^2-6lm+6lm -9m^2

=4l^2 -9m^2