Question

The common factor in the expression $18x^2-36x^4+72x^6$ would be

• A. $18$
• B. $18x$
• C. $18x^2$

Answer 1

The correct option is C $18x^2$

The expression $18x^2-36x^4+72x^6$ can be written as:
$18x^2-36x^4+72x^6=18x^2\times (1-2x^2+4x^4)$

From the above equation, we see that $18x^2$ is the common factor in the expression $18x^2-36x^4+72x^6$.