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prealgebra intermediate

Problem

Simplify

3 x 3 x 3 x x

.

(A)

x

(B)

3 x^{2}

(C)

27 x^{2}

(D)

54 x

Solution

3 x x = 3 (x)^{2} \cdot x = 3 (x)^{3} = x

. Therefore:

3 x 3 x 3 x x = 3 x 3 x x = 3 x x = x \Rightarrow x

Final answer

A