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Expand and simplify $(x + 3)^{2} - (x - 3)^{2}$ .

Class 8Standard IdentitiesAlgebra

A $12 x$
B $6 x$
C18
D $2 x^{2} + 18$

Step-by-Step Solution

(x + 3)^{2} - (x - 3)^{2} = (x^{2} + 6 x + 9) - (x^{2} - 6 x + 9) = 12 x

. (Or

4 ab

with

a = x, b = 3.

)

Answer: A)

12 x

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